Android only installs an update signed by the same key as the version already on your device. This timeline shows every signing key we've seen for Messages - Fast Messaging. One known signing key across every release we hold.
2.15
Current key1 release · Jul 28, 2026Every key we have ever recorded for Messages - Fast Messaging. New builds are compared against this set; a build signed by none of them is what our badge calls a mismatch.
Anyday Apps · Communication