[Onetouch Idol 3 Android Development] famewolf:
Can't help you there....DallasCZ posted a backup all batch file you could run on windows to backup all your existing partitions...I ported it to work under linux (quick and dirty) and it worked well enough there too.

For example here is the linux version:

echo BACKUP IDOL3 6045 partitions by DallasCZ _-_ Linux and Mac Shell Script by FameWolf
echo This script REQUIRES root and saves the backup to a folder named "'idol3_blocks'" in your home directory.
echo
echo Press enter key to begin or Ctrl-C to abort.
sed -n q </dev/tty
echo Working...
adb shell mkdir /storage/sdcard1/mybckup

adb shell su -c "dd if=/dev/block/mmcblk0p1 of=/storage/sdcard1/mybckup/modem"
adb shell su -c "dd if=/dev/block/mmcblk0p2 of=/storage/sdcard1/mybckup/tunning"
adb shell su -c "dd if=/dev/block/mmcblk0p3 of=/storage/sdcard1/mybckup/traceability"
adb shell su -c "dd if=/dev/block/mmcblk0p4 of=/storage/sdcard1/mybckup/fsc"
adb shell su -c "dd if=/dev/block/mmcblk0p5 of=/storage/sdcard1/mybckup/ssd"
adb shell su -c "dd if=/dev/block/mmcblk0p6 of=/storage/sdcard1/mybckup/sbl1"
adb shell su -c "dd if=/dev/block/mmcblk0p8 of=/storage/sdcard1/mybckup/rpm"
adb shell su -c "dd if=/dev/block/mmcblk0p10 of=/storage/sdcard1/mybckup/tz"
adb shell su -c "dd if=/dev/block/mmcblk0p12 of=/storage/sdcard1/mybckup/hyp"
adb shell su -c "dd if=/dev/block/mmcblk0p14 of=/storage/sdcard1/mybckup/modemst1"
adb shell su -c "dd if=/dev/block/mmcblk0p15 of=/storage/sdcard1/mybckup/modemst2"
adb shell su -c "dd if=/dev/block/mmcblk0p16 of=/storage/sdcard1/mybckup/simlock"
adb shell su -c "dd if=/dev/block/mmcblk0p17 of=/storage/sdcard1/mybckup/persistent"
adb shell su -c "dd if=/dev/block/mmcblk0p18 of=/storage/sdcard1/mybckup/splash"
adb shell su -c "dd if=/dev/block/mmcblk0p19 of=/storage/sdcard1/mybckup/tctpersist"
adb shell su -c "dd if=/dev/block/mmcblk0p20 of=/storage/sdcard1/mybckup/hdcp"
adb shell su -c "dd if=/dev/block/mmcblk0p21 of=/storage/sdcard1/mybckup/DDR"
adb shell su -c "dd if=/dev/block/mmcblk0p22 of=/storage/sdcard1/mybckup/fsg"
adb shell su -c "dd if=/dev/block/mmcblk0p23 of=/storage/sdcard1/mybckup/sec"
adb shell su -c "dd if=/dev/block/mmcblk0p24 of=/storage/sdcard1/mybckup/aboot"
adb shell su -c "dd if=/dev/block/mmcblk0p26 of=/storage/sdcard1/mybckup/boot"
adb shell su -c "dd if=/dev/block/mmcblk0p27 of=/storage/sdcard1/mybckup/recovery"
echo Long wait to image system. Please be patient. Copying roughly 3GB.
echo In another shell you can run "'adb shell ls -l /storage/sdcard1/mybckup/system'" to monitor the file size increasing.
adb shell su -c "dd if=/dev/block/mmcblk0p28 of=/storage/sdcard1/mybckup/system"
adb shell su -c "dd if=/dev/block/mmcblk0p29 of=/storage/sdcard1/mybckup/persist"
adb shell su -c "dd if=/dev/block/mmcblk0p30 of=/storage/sdcard1/mybckup/fota"
adb shell su -c "dd if=/dev/block/mmcblk0p32 of=/storage/sdcard1/mybckup/misc"
adb shell su -c "dd if=/dev/block/mmcblk0p33 of=/storage/sdcard1/mybckup/keystore"
adb shell su -c "dd if=/dev/block/mmcblk0p34 of=/storage/sdcard1/mybckup/config"

echo BACKUP copied partitions to hard drive... Another long wait.

adb pull /storage/sdcard1/mybckup ~/idol3_blocks/

echo BACKUP Done!
echo Press enter key to exit
sed -n q </dev/tty

The windows version is under the name "Backup_All.bat" here: https://drive.google.com/folderview?id=0B1T7tp6tJ_3kX3p6SUxWb2NfWTQ&usp=sharing I can't post a direct link to the file. You need to find someone that has not done the upgrade yet and get them to make a backup..you can then do the reverse and write those partitions to your device to get it back to the way it was.