Basically the top row (exept for “pause break”) keys are not working at all,

I have tried:

soft and hard resets of the keybord itself (“hold esc+caps, unplug, plug and release” and the synapse reset)

uninstalling the device from windows

uninstalling synapse

repairing synapse 

various reboots and/or unplugs (also changed USB ports)

what’s strange to me is that the last key is working.

BIOS side is normal as ever

is there anything else I can try?

Thanks in advice.