sLOID I've recently got same error and user OSA provided me with solution .I've used external SPI programmer get https://downloads.wdc.com/gpl/WD_MyCloud_GPL_v2.41.116_20201117.tar.gz extract u-boot.bin. WD_MyCloud_GPL_v2.41.116_20201117\firmware\merge\ It's 929388 bytes so we have to glue it to the rest of orginal spi dump : dd -if=wdc2.dump -of=temp.bin -skip=929388by nicefile - Debian