The keyboard switched to wireless mode and there is no way to get it back (Device Cidoo v 65)

[bropines]

I was setting up my keyboard and accidentally reassigned FN to f12. The funny thing is that I can’t delete the keyboard settings, nor switch to wired mode to destroy all the settings. I checked from the manual that the settings can be erased, but the keyboard does not respond to pressing space + backspace at the same time; they do nothing.