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 Viettel Tammi. One known signing key across every release we hold.
1.1.17
Current key1 release · Jul 28, 2026Every key we have ever recorded for Viettel Tammi. New builds are compared against this set; a build signed by none of them is what our badge calls a mismatch.