Phone is locked with an impossible to enter password

Question

As it appeared, the on-screen keyboard for entering the unlock password is missing English layout, although it for sure was present when the password has been created.
Now the situation appears really bad:




  • the phone (TP-LINK Neffos C9A, Android 8.1 NFUI 8.0) is locked,

  • the password is not possible to enter because of missing keyboard layout,

  • option for adding keyboard languages is not available,

  • there is no option "Forgotten password" and

  • Android Device Manager responds "Can't reach device" with either WiFi or 3G connection.



How to unlock the phone in such situation?


— hutorny | Sources

Answer

In case there is a problem with the on-screen keyboard most devices support to use an USB keyboard connected via USB On-The-Go (OTG) adapter to the phone - if the phone supports USB OTG at all.



The simpler an USB keyboard is the more likely it will work - keyboards with integrated USB hub and/or readers for smartcard or sd-card often cause problems and may not work.



Note that the USB keyboard works like a regular keyboard (not like the on-screen keyboard): key combinations like have be pressed at the same time, not one after another.


— Robert | Sources

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