How to switch keyboard language at login screen

Hello there!

I have ran into a problem recently, i cant quite log into my macbook air.

The problem is, that i’ve used a QWERTZ keyboard setup, but it switched -after the last update i installed in the morning- to QWERTY after the installation was done. The problem is, i’ve a specific character in my name, it’s the letter “Á”, which is on my keyboard but when i press it, it’s not an Á but a “. I tried to use shift+alt+Z, but it didn’t work. So I just can‘t login because i can’t write my name down..

Any solutions you got?