immich/mobile/lib/utils/version_compatibility.dart

String? getVersionCompatibilityMessage(int appMajor, int appMinor, int serverMajor, int serverMinor) {
  if (serverMajor != appMajor) {
    return 'Your app major version is not compatible with the server!';
  }

  // Add latest compat info up top
  if (serverMinor < 106 && appMinor >= 106) {
    return 'Your app minor version is not compatible with the server! Please update your server to version v1.106.0 or newer to login';
  }

  return null;
}