Update-signed.zip ~upd~
In the context of Android, update-signed.zip is the standard naming convention for a flashable zip file intended to be installed via a custom recovery (like TWRP) or Stock Recovery.
Are you trying to a specific device, or are you building your own custom update package? Update your device - Android Help update-signed.zip
Unattended or user‑triggered system updates must resist tampering, rollback attacks, and corruption. The filename update-signed.zip indicates two key facts: In the context of Android, update-signed