Réponse à : « Gboard is not available so now I cannot sign in. How can I fix this? »There should be a tiny hole (only big enough for a pin to be inserted) on the side of the device. On my Samsung it's on the top edge, on Lenovo it's on the side. Insert a pin or similar and press. This soft reset allowed my device to install the required update and returned the keyboard to working order. I then immediately removed the password.