ok, I'm not 100% sure how but got my buttons back
What I last did before they start working again was to boot into bootloader then recovery which was still default (open Robot with red triangle).
I kept volume up while pressing power as I've read on some post (hard reset?) and the phone rebooted to android with both volume and control buttons working.
Did I reset something extra or is it pure coincidence? Guess time will tell
My current Android devices:
- Nexus 5 (Stock 4.4.4 + root)
- HP Touchpad 32GB (Evervolv 4.3.1)
- Hyundai T7 (Stock 4.0.4 + root)