Thanks for the help guys
Though it's a bit of a moot point now, managed to update the firmware, first on a mac and then in a windows vm on linux
then I was using the scsi tool in the windoiws vm, scsi tool changed desf fine, then I put a paper clip in the reset button, just before I was about to install Rockbox
paper clip reset bricked the walkman
I'm not seeing anything in dmesg or lsusb
:/
the usb address was, and I'm writing this down now before I forget 054c:0b79
are there any ways to recover it or is it permanently dead?