adb push mtd4.new /tmp

adb push dd /tmp

adb shell
alias ll='ls -lha'
cd /tmp


chmod +x /tmp/dd
fota_release_space.sh

/tmp/dd if=/tmp/mtd4.new of=/dev/mtdblock4 conv=fsync

md5sum /tmp/mtd4.new

md5sum /dev/mtd4