I tried this
1) Go to Bios
2) Go to Settings/Security/UEFICapsuleFirmwareUpdates (This allows/blocks Bios updates from services such as WindowsUpdater
3) Deactivate this function
4) Boot PC & Login
5 (Maybe Optional)) Install all Windows Updates first ( Installed Bios 1.19.2 too)
6 (Maybe Optional)) Check that you dont have any Windows Updates left
7) Install Bios 1.15