Download unc0ver .ipa on unc0ver.dev
Download Cydia Impactor .exe
Import unc0ver .ipa on Cydia Impactor
Connect your iPhone to PC
Install mona unc0ver via impactor.
Open unc0ver on your iPhone
Hit "jailbreak" button
Wait.
Done.
Tingnan mo muna sir kung may jailbreak support ba yung ios 12.4.2 bago ka mag jailbreak. at bawal na po mag downgrade ng ios version kasi hindi na po sign ng apple yung ios 12.4