Try booting the OS from SDCard
https://www.mobileread.com/forums/sh...d.php?t=329270
Worked for me (Corrupted downgrade / corrupted eMMC / no wifi / usb crashes or won’t start unit) look further down the thread where they explain it further as it may be possible to just do it all from rupor’s image is depending where your eMMC corruption is. Download the image there as well and flash it to the SDCard it won’t have a serial number or MAC address but wifi will still work fine.