T440s - keyboard is broken after BIOS update to 2.25

Hi,
today I've updated my Lenovo T440s BIOS to 2.25 version. The update was performed using Software updates in Lenovo Solution Center and everything was successful.
After computer reboot the keyboard has been mulfunctioned:
when I hold Windows Key the following char is produced {}Y (moreover on Windows 8.1 speekers turn downs, metro apps panel from W8.1 is show and next chars are uppercase)
when I press/hold Right arrow key the following char is produced ń
This is not OS dependent issue - I tried to use Rigth arrow in BIOS menu and it doesn't work.
Do you have any suggestions what to do? Or any tips how to restore previous version of BIOS?
I'm looking forward to hearing any tips.
qinto

Roll-back to 2.24 version fixed the problem, but the issue with current BIOS version remains.
EDIT: Unfortunately the roll-back hasn't solved the problem - working with keys mentioned above is better, but still holding Win Key and Right Arrow causes the same problems.
Greets,
qinto

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