Remove the microSD card, if present. You can use a flat side of a spudger

With a Pick, insert the tool and split the two parts that make the shell of the mp3 player

Use Jimmy, if the pick is too flexible for you

Remove 3 screws with a #00 Philips screwdriver

Remove the switch with the shape of a spudger

That's all. The screen is welded and coated with glue.

command bottons

usb port

the switch

SD card holder

Full IC Identification:

Predicted Block Diagram is on the 2nd image.