Keyboard Problem in Hard Reset w1-810

Hello, i want to reset my w1-810 (Windows 10) and the HDD seems unlocked. I tried to reset it through windows and the message says that this action cannot be done (neither keeping or deleting all files). I hard reset it (Shift + Restart) and it asks me for the 48-chars recovery key (including letters) because the drive is bitlocked. I have this key but i can't enter it because the on-screen keyboard has only numbers. Also a usb keyboard writes only numbers although it works fine in Windows.