Made in France, this v2 is identifiable by the inscription on its label.
You can follow this tutorial to replace the...
The rotary encoder is located under the large...
Battery
Battery Removal
Circuit Board Removal
Opening
Repairing a cut runway (trace? wire? [unclear])
Rotary Encoder
Screen Removal
Selection Knob Removal
Speaker Removal
Volume Dial Removal
These are some common tools used to work on this device. You might not need every tool for every procedure.
T6 Torx Screwdriver