Patch system/update_engine/verifier.cc :
In Android, liboemcrypto.so is the bridge library between the app and the hardware-backed DRM. Many Delta ROMs patch or remove this library to fix other issues (like audio latency), inadvertently severing the KeySystem link.
Understanding this link helps you:
: Be cautious of "No Key" versions or APKs found on unofficial sites; these are frequently used to distribute malware. direct link