Here is some photo of the process.
Yesterday the MnM boot and after few pattern change it freeze after 3 minutes of use.
I stop it and restart it and still stuck.
So I’m in the process of replacing battery which was never changed.
Take real care when removing the UI pcb in green. There is really small cable between the green pcb and below pcb. And not lots of room to unplug those cable.
The battery is a CR2450, unfortunately I was sure it was a CR2032. And 2450 are bigger.