Help, Faked my ios version by changing system files

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https://lemm.ee/post/11901350

Spoofed my ios version to 15.4, Modified software services plist file, restarted my ipad and..voila! Lost my jailbreak.

Any tutorial or video to get it back to original 14.3 version? 3utools or something?

Thanks

Edit: Reinstalled uncover again with altstore, restored the plist file, I'm not ready to lose my jailbreak šŸ˜„