Update-signed.zip

: Operating system files are highly specific. A file meant for an international version of a phone will likely brick a US carrier version of the exact same phone model. Double-check model numbers (e.g., SM-G991B vs. SM-G991U) before flashing.

: Move the .zip file to the root directory of your device's internal storage (not inside any folders). Installation : Navigate to Settings > System > About phone . Tap Software Update or Check for updates . update-signed.zip

: These packages typically contain replacement system files, boot images, and an updater script that executes the replacement process. How to Install update-signed.zip : Operating system files are highly specific

: On your phone, go to Settings > About Phone and tap Build Number seven times. Go back to system settings, enter Developer Options , and turn on USB Debugging . SM-G991U) before flashing

Stock recoveries will only flash files signed with the official OEM keys. If you try to flash a custom modification via stock recovery, it will fail.

These are the cryptographic signature files that verify the integrity of the zip.