This worked for me. Putting music on locked Clip Sport

I have this mp3 player made by SanDisk…a clip sport model. The issue that makes this different from a normal player is this one was sold to people in prison so it is locked up tight…won’t even allow a firmware update or factory reset.

So it has a few songs on it, held on its sd card. I tried putting an m3u and corresponding mp3 files on it, and it played them once or twice, but I couldn’t replicate the results ever again.

Curious about the model, I bought a retail version of the player off eBay, then put the locked player’s sd card in it and moved all my mp3 files to a user file that shows up on the player as GOLIST[1]. Now when I put the card back in the locked unit, all my music plays from the GOLIST[1] location.

My question is, how can I put my mp3 files directly into the .PL file circled in the image…locate here
https://app.box.com/s/cionvyf98x9gn01bgj9imewsjh6eecq3
https://app.box.com/s/hqod9q4y524w42woqj7r6wtb1y96oy5l

you can send the player back to the company that sold it and get the lock removed. 

https://kb.sandisk.com/app/answers/detail/a_id/12839/ 

Anyway I can do Icare data recovery or similar to find files with out access to PC with phone only

Is there any way to solve this without sending it in? I tried adding m3u playlist onto the mp3 player, but it says the playlist is empty and won’t play any songs.