http://forum.xda-developers.com/showthread.php?t=1015005
I have asked question
http://androidforums.com/viewsonic-tablets/345625-how-backup-viewpad-7-original-rom.html#post2755471 but I focus on below to continue my process of backup the ROM -Stock Backup:
1. Open up ADB shell within a terminal.
2. Get the list of partitions: cat /proc/mtd
3. Pull each original partition from the device onto the SD card: cat /dev/mtd/mtd3 > /sdcard/recovery.img (example...change for each partition)
Install Alternative Recovery Partition:
1. Copy the flash_image and clockwork recovery image to your SD Card (Find Attached Below).
2. Open a terminal (via computer or terminal emulator). Enter ADB shell.
3. Within ADB shell enter the following to change permissions for the flash_image: chmod 755 /system/bin/flash_image
4. Replace the original stock recovery image by copying the clockwork image in it's place: flash_image recovery /sdcard/cwrecovery.img
[I do a su command infront together with the command still to solve the following error
error writing recovery: Permission denied]
Installing Custom Firmware:
1. Copy the custom firmware of your choice to the SD card.
2. Power down your device.
3. Depress both volume keys simultaneously followed by holding in the power switch for a few seconds.
4. Upon power up you will see the birds logo and 'enter recovery' text in the top left corner of the screen.
5. Use the volume keys to step through the menu.
6. Select 'Backup & Restore' followed by 'Backup' to make a 'NANDROID' backup of the current firmware. The backed up ROM should be located in: /sdcard/clockworkmod/backup/date&time/
7. Once the backup process completes you will be back at the main recovery menu.
8. Select 'apply sdcard: update.zip.
9. Once complete select 'reboot device'.
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