use lsblk 1st,, boot0,boot1 is emmc (DO NOT use boot0, boot1)
(as root, sudo),,, if= input file,,, of= output file
either /dev/mmcblkX, X=1 or 2 (whole device) OR /dev/mmcblkXpY (partition Y, Y= 1 or 2))
Never use (dd's) default block size for flash (512B), always at least 256K
(me,,, bs=1M),,,, sync when done
For 1st sector, mbr,,,, dd if=/dev/SD of=savedSD.mbr bs=512 count=1
For 1st 16M (mbr+uboot) ,,,, dd if=/dev/emmc of=1st16m.emmc bs=1M count=16
replace emmc and SD with appropriate, of= can have paths if needed,
ie of=~/saved.mbr,,,,~=home
(as root, sudo),,, if= input file,,, of= output file
either /dev/mmcblkX, X=1 or 2 (whole device) OR /dev/mmcblkXpY (partition Y, Y= 1 or 2))
Never use (dd's) default block size for flash (512B), always at least 256K
(me,,, bs=1M),,,, sync when done
For 1st sector, mbr,,,, dd if=/dev/SD of=savedSD.mbr bs=512 count=1
For 1st 16M (mbr+uboot) ,,,, dd if=/dev/emmc of=1st16m.emmc bs=1M count=16
replace emmc and SD with appropriate, of= can have paths if needed,
ie of=~/saved.mbr,,,,~=home
