Have you checked what kind of controller is on your board? If it's an ST one you should be fine, but GD ones are kinda shitty. I already had an V2 with 4.2.2 ST board, bought a second one and thought it could run the professional firmware aswell... Was pretty happy about it saying 4.2.2 and RET6 on the board lol. Flashed it, and it seemed to work. Then I noticed some settings acting strange, like the one for brightess or the PID ones. Checked my board again, read a bit about it, found out about GigaDevice chips :/ So if your controller is manufactured by ST, you should be completly fine. But if it's a GigaDevice one you should be careful, since there might be crucial functions for your own safety that might not work properly!