i recently bought an ipod classic 6th gen from ebay with a working install of rockbox 3.15. everything worked fine. i was eventually advised to update to a daily build so before everything went south it was running the one from 3/21/25.
somehow, while leaving the device unattended and idling for ~45 minutes, the filesystem became corrupt and displayed the screen in the first image. upon booting into the rockbox bootloader it gave an error along the lines of "rockbox.ipod" being missing. i tried installing rockbox again via the windows utility with no success.
upon booting into disk mode, image 2 is what i see.
additionally, the apple devices program on windows cannot recognize my device (image 3.) i have tried reinstalling ipod support drivers (usbaapl64.inf file) to no avail. my version of itunes has no device support. (should i try downgrading?)
i am totally lost. 
EDIT: some additional info -- this is an original motherboard with an iflash SD card adapter, 512gb.