[chirp_users] Baofeng UV-5R menu locked

Greetings from France.

When I first got my UV-5R, the channel programming with CHIRP was performed by a friend, who locked the menu button to prevent a beginner like me to make any mistake which could have screwed the programming.

Now I would like to unlock the menu, but I cannot figure out how to do it. I did quite a lot of internet research, but I could only find duplicate tutorials on how to lock the pad with the key button. That is not what I am looking for, of course. The menu button is unresponsive, I would like to unlock it.

Thank you in advance for your help.