I have 2 Opi 3B boards, v1.1 and v2.1. I tried both with the latest firmware and I noted that it’s DietPi version v10.0.-1 (dev).
So there’s some problems with this version:
On boards v1.1 and v2.1, the default kernel is the ‘current’ and the governor is always ‘ondemand’ after reboot… this happens with ‘current’ and ‘edge’ kernels. With vendor kernel, the governor is what you chose in the dietpi-config menu.
Also, board v1.1 wifi does not work on boot, only after you type “modprobe sprdwl_ng”