This is only for windows users.
Also only for rockchip 2818 not for other ones!!!
What do you need
Winrar < Not included in package!
Rockchip flash program
SD card or internal memory on the device self (150mb atleast)
Programs can be downloaded in this package
So al the progams you need are in the rar file.
1. Preparing the device
First install Z4Root and SU on you're device.
Then start Z4Root and click on ''Temporary Root" he will root the device for you and after reboot you will loose the root access so don't reboot!
After that connect you're device to an windows machine he will ask you to install drivers.
Install the drivers and then start CMD
(Windows XP: Start > run > CMD > Enter)
(Windows vista and 7 Start > Type CMD > Enter)
now locate to the ADB.exe folder i recommended to place it in the C: root.
so type this in CMD
when you are there type this command.
adb push rkdump /data/
After that type adb shell
this command bring you to a terminal like command line for you device.
Ok now watch you're device and type su in cmd.
A popup will show up to get SU access for terminal press "allow"
Now we can backup the FS.
type this in cmd
a list will popup like this one
mtd0: 00002000 00000010 "misc"
mtd1: 00004000 00000010 "kernel"
mtd2: 00002000 00000010 "boot"
mtd3: 00004000 00000010 "recovery"
mtd4: 00030000 00000010 "system"
mtd5: 0003a000 00000010 "backup"
mtd6: 0003a000 00000010 "cache"
mtd7: 00100000 00000010 "userdata"
mtd8: 00cbc000 00000010 "user"
mtd9: 00020000 00000010 "pagecache"
mtd10: 00020000 00000010 "swap"
i made one red because that the line we need.
NOTE: we need backup partition so look always to mtd number not every device have backup as mtd5 it might also be 6 or 1 or some other random number!
Now it is time to backup!
/data/rkdump /dev/block/mtdblock? /!!!/update.img
place the number of the mtd on the ''?''
if example your number is 6 use it like this
place the destination backup folder on the !!!
flash for the tablet internal memory
sdcard for to backup on the sdcard
if you did this good it will say this
update.img found (116115456 bytes) < File size may be difference depends on device.
after it is done it will say this
crc found (4 bytes, 0x0709e735) < Also this could be difference
Gongrats you backup you're FS now you can destroy you're device with custom roms!
2. Restore you're FS
Sometime you will see you destroy you're device what now!
Good thing you made a backup of you're FS!
First Hold back/ecs button on you're device just hold it and put the usb cable in it.
(From pc to the tablet ofcourse)
you're pc will give you a driver notice install them (included from the package)
After that start RKAndroidBatchUpgrade.exe
Then choose in settings you're backup and press ''Upgrade''
Wait a few seconds or minutes and you are done.
congrats you can use youre device again!