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List of Best Custom ROM for Samsung Galaxy S21 Ultra Based on Android 11

gooroog

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Latest Updated Custom ROMs for Samsung Galaxy S21 Ultra​

In this Section of the post all the Features and Specifications of Various Roms are Introduced which can be Installed on Samsung Galaxy S21 Ultra. The Pros and Cons are Discussed as Below :-

Pixel Experience ROM


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If you want to experience stock-based UI on Samsung Galaxy S21 Ultra then no other ROM can beat the Pixel Experience. It gives full experience of Pixel on Samsung Galaxy S21 Ultra and on top of that, it comes with the latest Android OS with 11th Iteration. The ROM has gained the popularity since the launch of Google Pixel 2. In this ROM the Google Camera comes by default so you do not have to enable Camera2 API on your Samsung Galaxy S21 Ultra.From my experience, I can say that this ROM is the fastest ROM and also it is ideal for gaming in Samsung Galaxy S21 Ultra. But if you are looking for a customizable ROM then this ROM is not for you. And if you need performance just go for this ROM and you will not be disappointed.

Oxygen OS ROM
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You all know Oxygon OS is the official UI for OnePlus Samsung Galaxy S21 Ultras and developers have ported the Oxygen OS directly from OnePlus 9 to Samsung Galaxy S21 Ultra which is based on Latest One UI. The ROM is based on Android11. All the gestures that are available on OnePlus 9 are also working on this ported ROM for Samsung Galaxy S21 Ultra.The ROM performs well in Antutu benchmark and secured good numbers while experimenting on Samsung Galaxy S21 Ultra. Games also work good on this ROM but compared to pixel experience it lags behind. If you decided to go for this ROM I will suggest to go into setting of Samsung Galaxy S21 Ultra and hide the Notch. And battery performance is not up to the mark but you can flash custom kernel and fix that too.

Resurrection Remix ROM​

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Resurrection Remix is one of my favorite custom ROM for Samsung Galaxy S21 Ultra since I started to know about custom ROMs. Because of reliable and bug-free experience. This ROM supports most of the devices including Samsung Galaxy S21 Ultra. The Resurrection ROM is based on Android 11 and Android 12 as well.This ROM is especially for the users of Samsung Galaxy S21 Ultra who like the balance between customization and performance. The ROM gets the update very frequently which helps in providing bug-free experience to users of Samsung Galaxy S21 Ultra. Whenever Google will Launch Android 12 , this Rom will Also Start Giving Android 12 Update too for Samsung Galaxy S21 Ultra which is good Point for this Resurrection Remix ROM for Samsung Galaxy S21 Ultra Based on Android 11.

Liquid Remix ROM​

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Liquid Remix is a smooth ROM with long term usage without affecting the performance of Samsung Galaxy S21 Ultra. It is an Android 11 based ROM with lots of manual customization options for UI. It also supports Face unlock and Fingerprint unlock. It comes with enabled camera2 API and Google camera app by default which is not working good at all in Stock Rom.The ROM supports OTA update so that’s another advantage of this ROM. It has various gestures to choose from like AOSP gesture, Carbon gesture, and stock gesture. All the gestures work well on Samsung Galaxy S21 Ultra after Installing this Android 11 based ROM.

Havoc OS ROM​

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If you are a user who likes too much customization the Havoc OS ROM is for you. The customization on this ROM is just insane, almost everything in this OS is customizable which is not available in Stock Rom of Samsung Galaxy S21 Ultra. After installing this ROM you don’t need modules which are made for customization. It is an Android 11 based ROM .The ROM also performs very well on multitasking and gaming. So you can use it for a long duration of time without any problem. You can enable camera2 API on this ROM by going to settings and toggle the option. The battery life on this ROM is also good which last around 15 hrs, and you can also extend it by some tweaks on Samsung Galaxy S21 Ultra.

AOSiP ROM​

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The recent update of AOSiP ROM for Samsung Galaxy S21 Ultra is running on Android 10 Q official build. Earlier there were many Android Pie versions of this ROM were released, but all of them were in beta. The experience that this ROM provide on Samsung Galaxy S21 Ultra is just amazing. Fingerprint sensor on this ROM is faster than other ROM. The ROM build that I tested does not have any camera preinstalled. But the camera2 API on this ROM is enabled by default. So you can install Google Camera or any camera you want on your Samsung Galaxy S21 Ultra Device. The apps on the Samsung Galaxy S21 Ultra load a bit slower but it is having good RAM management. It comes with all the stock customization. But other than stock it does not offer many customizations that are available on Havoc & Liquid Remix.

Syberia Project ROM​

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Syberia Project is a well developed ROM for Samsung Galaxy S21 Ultra. Both Official and Unofficial build of this ROM are good and less buggy. It is an AOSP based ROM developed by ‘Syberia Team’. The ROM gives more like stock experience with few customizations. The Camera2 API on this ROM is disabled by default and also not included any toggle to enable in Settings. So you have to enable from Magisk or by connecting Samsung Galaxy S21 Ultra to PC. The experience you will get in this ROM is amazing, because of its multitasking performance and RAM management. Google pay is not working on this ROM in the build I tested, but in later updates, it can be fixed for Samsung Galaxy S21 Ultra. Although you can use Google Pay and other banking App by changing some settings in Google Play services for Samsung Galaxy S21 Ultra.

PE Extended ROM




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If you are thinking that its another Pixel Experience ROM for Samsung Galaxy S21 Ultra then you are right. It is a Pixel Experience ROM with extended features like customization and all. As this is a Pixel-based ROM the Google Camera comes pre-installed with this ROM. Also, you can install any other Manual Camera, because the Camera2 API is enabled by default. The ROM includes GApps by default and so you don’t have a burden flash GApps manually. If you are looking for a ROM with Maximum performance and customization as well then you can try this ROM on Samsung Galaxy S21 Ultra.

Arrow OS ROM​

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Arrow OS is an AOSP based custom ROM developed for many devices. The UI on this ROM is simple, clean and attractive based on Android 11. And also delivers great performance including Multitasking, RAM management, gaming etc. The main feature of this ROM is that it supports dual VoLTE, yes both SIM supports VoLTE .The ROM gives a complete stock look on settings, toggle bar, notification panel, and launcher. Battery performance on this ROM is average but with custom kernel and few tweaks you can increase the battery performance for Samsung Galaxy S21 Ultra.

Lineage OS ROM​

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Lineage OS is a very popular custom ROM among developers. They like to work on it because of its popularity and great response. The Android 11 built (unofficial) of this ROM is now available for Samsung Galaxy S21 Ultra. The performance of the custom ROM is really good. It is also an AOSP based ROM and offers great RAM management and multitasking feature for Samsung Galaxy S21 Ultra. Official build is not available right now but there are chances that developer will show interest in developing LineageOS 19 for Samsung Galaxy S21 Ultra very soon.
Pixel Plus Rom

Almost all Samsung Galaxy S21 Ultras have a battery saver application that gets activated automatically whenthe battery falls below 15-20% or you can even switch it on manually. In Havoc however, you get multiple features to do so. One such feature is ‘Sensor block per-package’.You can switch it on manually. What this feature does it that it essentially blocks the access to certain sensors on your Samsung Galaxy S21 Ultra for certain apps, which saves battery. Another feature is ‘Alarm blocker’, which prevents certain applications from wakingup your Samsung Galaxy S21 Ultra when you get notifications. Using these battery saving features can sometimes give you a massive boost in screen-on times ,notification shade further down. MostAndroid skins allow you some basic quick settings including Wi-Fi, Bluetooth, Mobile data toggles, etc. Havoc-OS, on theother hand, can offer you multiple quick setting toggles, and even some features that wouldn’t previously exist on your device like screen recording (which can be accessed from the quick setting
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EvolutionX ROM


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EvolutionX ROm is Also One of the Best Custom Rom for Samsung Galaxy S21 Ultra. After testing this ROM I have found that this Rom Lags Some Bit in RAM Management , Although the ROM is Based on Android 11 which is plus point of this ROM . But , I suggest you to Try LineageOS First on Samsung Galaxy S21 Ultra.

Liquid Remix ROM

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This Rom is Also Available for Samsung Galaxy S21 Ultra with Google's Latest Version of Android OS i.e. Android 11. All the System Apps on this Rom are Well Optimized Like Other Stable Roms . Later on After some time the developer of this Rom may introduce this Rom with Android 12 for Samsung Galaxy S21 Ultra.

MSM Xtended ROM

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This Rom is Purely Based on Android 11 Stock Version , But have Some Optimizations made Specially for Samsung Galaxy S21 Ultra. The users of Samsung Galaxy S21 Ultra which are Gaming Lover may Try this ROM.

POSP ROM

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The full form of POSP is Potato Open Source Project and from name it is clear that this Rom based on Android 11 is similar to AOSP and Similar features of AOSP is Imparted on this Rom with some Optimizations Specially made for Samsung Galaxy S21 Ultra.

Resurrection Remix ROM

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This ROM is combination of all the popular Roms available for Samsung Galaxy S21 Ultra such as AOSP , AICP etc and Purely based on Android 11 . If you want to taste All the Roms in One ROM then No ROM is better than this. Just go and Try this ROM.

Stag OS

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It is a very new ROM for Samsung Galaxy S21 Ultra based on Android 10 Q and Specially designed for Samsung Galaxy S21 Ultra. Google Camera comes Preinstalled on this Rom for Samsung Galaxy S21 Ultra and Additionally this ROM is also having DOLBY Atmos MOD Specially designed for Music Lovers.

Pixys OS

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From the name it is clear that this Rom for Samsung Galaxy S21 Ultra is based on Google Pixel 5 embedded with Android 11. And the ROM itself is Optimized and better than Pixel Experience ROM . During Testing I have found that the ROM is Lagging in Call Recording Features , But Later on we can Fix that issue after Installation.

MOKEE OS ROM

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MOKEE Rom is a typical custom rom for Samsung Galaxy S21 Ultra Based on Android 11 and it is a different type of Rom having Extra Ordinary Features other than Basic AOSP Roms . If You want to Root Samsung Galaxy S21 Ultra then this ROM is Best For You Because it is a Pre-ROOted ROM. So, No need to Flash Other Files and Kernels for Samsung Galaxy S21 Ultra.

AICP ROM

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AICP is one of the most Recommended ROM for Samsung Galaxy S21 Ultra because it is Similar to AOSP with Some Extra Optimizations and User Interface of this ROM is Purely Based on Both Android 11 and Android 10 , Some things are Directly taken from the base file of Stock Android 11 & some are taken from Android Q.

AOKP ROM

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After some Testing it was Found that this ROM Shows Better Results than Pixel Experience Rom when Compared with the Battery Life of Samsung Galaxy S21 Ultra. The Netwok issues found on this ROM in the Previous build of Android Q is Now Fixed in the Android 11 Source File of this ROM.

OMNI ROM

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The name of the ROM Comes From two words OM+NI , Which means the Rom is Having New Features But In Addition to this ,The ROM is Having Old Stock Android Theme of Android 8 OREO . The Android 11 Comes with New Theme and UI , Which was never experienced in the past of the Android . But Some of the users of Samsung Galaxy S21 Ultra were missing the old UI of Android OREO . So, Developers made this ROM for that users of Samsung Galaxy S21 Ultra.


AOSIP ROM

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The full form of this ROM for Samsung Galaxy S21 Ultra is Android Open Source iLLusion Project . Specially built to have experience of Android 11 on Samsung Galaxy S21 Ultra . In this ROM Google Camera API 3 is Available for Samsung Galaxy S21 Ultra. In Addition the ROM comes with Pre-ROOT and Also the Radio App of this ROM is Working without using headSamsung Galaxy S21 Ultras.

Candy ROM

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As from the name the ROM is as Sweet as Candy . From testing and experimenting it is found that the Rom gives Quite Good performance with compared to other ROMs. This ROM is Purely Based on Android 12 . So, If You want to install Android 12 on Samsung Galaxy S21 Ultra ,Then Go Ahead.

XenonHD ROM

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Xenon HD Rom for Samsung Galaxy S21 Ultra is based on Android 11 and the ROM is designed only for the users of Samsung Galaxy S21 Ultra , Who loves Photography . Yes, This Rom is Having many Camera Features and Modifications to Samsung Galaxy S21 Ultra which were never seen on any other ROM. This ROm is Having 108MP DSLR Camera MOD for Samsung Galaxy S21 Ultra.

Carbon ROM
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The users of Samsung Galaxy S21 Ultra demanding for Dark Mode Like iOS 14 or iOS 13 or iOS 12 on Samsung Galaxy S21 Ultra may use this ROM . This ROM is Personally Tested by me and Gives Favourable Outcomes for Samsung Galaxy S21 Ultra. So of the Apps of this ROM is Directly taken from iOS 14 Specially for Samsung Galaxy S21 Ultra . The Samsung Galaxy S21 Ultra will be having Same Calculator and Dialler App as of iPhone 12 after installing htis ROM.

AOSmP ROM
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The Full form of this ROM is 'Android Open Source minimal Project' . The Rom is Based on Android 11 and having Special Optimizations of Battery Backup and Network Performance for Samsung Galaxy S21 Ultra , Which means that their will be no need of Installing Extra Kernels to Fix these Problems Like Other ROMS.

Cosmic OS

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This ROM is Based on Android 10 Q and Some Features are Taken from the Source file of Android Pie. The ROM is Having Similar Navigation Bar and Recents Menu App as of iPhone 12 taken from iOS 13 for Samsung Galaxy S21 Ultra. Later on the Developer may Introduce this ROM for Android 11 As well.

iON OS ROM
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This ROM for Samsung Galaxy S21 Ultra is Purely based on iOS 14 . The Navigation Buttons , Recent App Menu , Notification Slide is Similar or directly imported from iPhone 12 Stock Firmware Source File and Specially made for Samsung Galaxy S21 Ultra. In the Stock form the ROM is Based on Android 11.

MIUI 12.5 ROM

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As from the name the Rom is Based on MIUI 12.5 and Works on Android 11 out of the way for Samsung Galaxy S21 Ultra. All the Apps are Directly imported in this ROM from the Stock Firmware of MI 11 . Therefore we can also name this Rom as Mi 11 Custom ROM for Samsung Galaxy S21 Ultra . But this ROM is Not for the users who like Stock Android . So , Choose this ROM for Your Samsung Galaxy S21 Ultra Only if You Like Non Stock Android User Interface.

Revenge OS ROM

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Revenge OS is a new Custom ROM designed on the base of Lineage OS and brings many new features that may not be present in other Custom made ROM for Samsung Galaxy S21 Ultra. The ROM brings a System-wide Rounded UI, Spectrum support, Battery Teak features, Status bar tweaks, OmniSwitch and Slim recent option for quick multitasking and many more Only for Samsung Galaxy S21 Ultra.

Oxygen OS Rom

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This ROM is Based on Oxygen OS 11.0. The Features of this ROM Comprises Dark Mode Scheduling for Samsung Galaxy S21 Ultra , Nightscape and Portrait Video MOD, CANVAS AOD for Samsung Galaxy S21 Ultra ,Google Discover Feed and Smart Gallery for Samsung Galaxy S21 Ultra. Zen Mode 2.0 and One Handed Redesigned UI for Samsung Galaxy S21 Ultra Specially imported from OnePlus 8T Firmware Flash File . So we can Also name this ROM as OnePlus 8T Custom ROM for Samsung Galaxy S21 Ultra Based on Android 12.

CopperHead OS ROM

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CopperHead OS ROM Android 11 Based for Samsung Galaxy S21 Ultra is imported from Google Pixel 5 & Having Google Camera API 3 Pre-Installed . This ROM is having Top Antutu Benchmark Score as Compared to other Custom Roms for Samsung Galaxy S21 Ultra.

CrDroid ROM

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This ROM is Typically Based on Android 11 & LineageOS Rom Combined out of the way for Samsung Galaxy S21 Ultra. This ROM comes with Latest Version of GAPPS Android 11 for Samsung Galaxy S21 Ultra Pre-Installed . Also Pre-ROOT Version & OTA Update Android 12 for Samsung Galaxy S21 Ultra will come on this ROM.

RevengeOS Android 11 ROM

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This ROM is another Alternative of AOSP Rom which is based on Android 11 Exclusively available for Samsung Galaxy S21 Ultra . Whenever the Android 12 will Release The Rom will start Giving Update Over the Air (OTA).

CyanogenMod Android 11 ROM for Samsung Galaxy S21 Ultra

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CyanogenMod is the most Popular ROM for Samsung Galaxy S21 Ultra , Now a days LineageOS has Replaced This ROM.This ROM introduces extra ordinary features of Android 11 to your Samsung Galaxy S21 Ultra. Also Android 12 Update will be Available to this Rom OTA.

EMUI 11 ROM

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The Full form of this ROM is Emotion User Interface . EMUI 11.0 is the Latest Build of Android 11 for Samsung Galaxy S21 Ultra. Dark Mode is the One of the Best Feature of this Rom. This ROM is directly imported from Huawei Mate 40 Pro and this Rom is also called as Huawei Mate 40 Pro Android 12 Custom Rom for Samsung Galaxy S21 Ultra.

Flyme 8 ROM
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This ROM comes with the Latest Version of Flyme OS with Version 8.0 which is based on Android 11 and comes with plenty of Features Such as Smart Camera MOD for Samsung Galaxy S21 Ultra and DTS Dolby Sound Box Pre-Installed Exclusively for your Samsung Galaxy S21 Ultra.But , During Testing I found that this ROM is Lagging with some Network Isssues. But Wifi is Working Fine.







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