Installed Version 5 on UV-K5(99) but it hangs on WAIT

When I try to switch to the HF mode by pressing FM
The screen just hangs saying "WAIT".

Any clue to why that is?

I recently bought and followed the 2.5v mod instructions found on youtube, but... it works in normal mode (FM VHF and all that), so the radio chip is clearly in use.

But it hangs when entering hF mode, just says WAIT on the screen

Any suggestions? (I use firmware xxxxxxxx51 )