i start it up and it says it failed to load rockbox. i just reformatted it but still it won’t work. after that message it shuts off. message lasts like 2 sec on screen.
You need to either reinstall rockbox, or uninstall the rockbox bootloader. Formatting won’t help with that. Reboot into the Sandisk firmware (hold left Iwhile booting), then either install a build of rockbox to the player, or reinstall the sandisk firmware.