75XX XNAND Recovery
From embeddedTS Manuals
This needs to be done directly on the SBC. Please note that all NBD partitions from the NAND card must be dismounted before attempting to image the NAND on the SBC.
You can find the latest xnand image here.
Backup
nandctl -XR 2048 -z 131072 > backup.dd
Restore
nandctl -XW 2048 -z 131072 -i /path/to/xnandimg-latest.dd