Hi, Dmitry,
In your case, yes, the BIOS version should be R1170V8, my applogies!
Yes I did Restore Factory Default in the "Security..." section, it works for me. First, I cleaned the cache, after that, I could pair the keyboard with my Tap11. Furthermore, when the keyboard is detached and turned on, it connects to Tap11 automatically at the login screen. Moreover, it works fine with both Windows 8.1 and 10.
Sony just released the new BIOS for SVT11227PXB. Maybe you have to wait for new firmware for the wireless keyboard. Sorry I cound not help you.
Cybermark