I am a UHK60 v2 user.
I have two issues after the recent 12.1.0 & 12.2.0 firmware upgrade.
When moving the mouse cursor with the keyboard, there is no problem with direct USB connection, but when using the Bluetooth adapter, there is a delay when moving the mouse cursor with keyboard input. (To the point of being unusable.)
There is a key layout bug that seems to occur when considering the UHK80 keyboard on the right keyboard. You can check it by moving the keyboard with the mouse in the agent and setting it. It occurs on the PrtScr, ScrLK, Pause keys.
The first issue is solved by changing the firmware to 11.2.0, but the agent is forced to update, so the agent is no longer usable.
P.S. Please make a Bluetooth keyboard with the UHK60 version.