Wala pa pong jailbreak for iOS 14.5 afaik, especially since kare-release lang nito about three (3) days ago. I am curious how you were trying to do it on your iPhone 6s since none of the major iOS 14.x jailbreak tools have been updated yet to support or work with the latest Apple firmware (at least that's what I saw on their respective official websites).
So exactly which jailbreak tool did you use po ba?