CMP741E Complete Nandroid Backup

[mastermind278]

Alright so I was able to get a full Nandroid backup of the CMP741E.

I knew the issue was with CWM so instead of using CWM 6 (as previously recommended), I decided to use CWM 5.5 that worked just fine! I installed the Allwiner A10 Aurora/Elf (last item on this site: CyanogenMod for Allwinner A10 tablets | androtab.info)

Now I am not 100% sure that CWM 5.5 backups work on CWM 6 but we officially have a BACKUP! Again it isn't a virgin backup as I have Gapps installed but as close as it gets!

I am uploading it now!

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[mastermind278]

Alright so I was able to get a full Nandroid backup of the CMP741E.

I knew the issue was with CWM so instead of using CWM 6 (as previously recommended), I decided to use CWM 5.5 that worked just fine! I installed the Allwiner A10 Aurora/Elf (last item on this site: CyanogenMod for Allwinner A10 tablets | androtab.info)

Now I am not 100% sure that CWM 5.5 backups work on CWM 6 but we officially have a BACKUP! Again it isn't a virgin backup as I have Gapps installed but as close as it gets!

I am uploading it now!

Dev-Host - Craig_CMP741e_NANDROID_CWM55.zip - The Ultimate Free File Hosting / File Sharing Service

That is a full backup that looks good! Please let me know if it works!

[c19932]

Dev-Host - Craig_CMP741e_NANDROID_CWM55.zip - The Ultimate Free File Hosting / File Sharing Service

That is a full backup that looks good! Please let me know if it works!

Thanks for the new backup! I installed cwm 5.5 on my tablet and restored your nandroid (I had to strip down the system.ext4.tar to less than 250mb because the firmware I flashed on my tablet only has 250mb /system partition). I can now boot past the splash screen and into android OS!!! That proves that your nandroid works.

However, my touchscreen, g-sensors, and such still don't work. (recall that I needed to flash a firmware meant for another device, and it makes the tablet touch screen non-functional). So I guess the drivers/configuration for touchscreen is not contained in the /system partition?

not sure if this could be helpful in your case: but finding this post got mine unbricked. I did not even have to do anything but holding down the reset and power at the same time which I never would have thought of without BigBangBoom's genius post. I have the cmp741e too.

From BigBangBoom's post:Fixed my brick

I have the magni tablet 10, earlier today it bricked after i loaded some different software onto it (Not in the Slide Sam repository), things were going well until i reset the tablet...... Sylvania screen nothing more frozen solid. I went through many many many forums and could not get any of the suggested methods to work on getting it back. I started randomly holding down buttons and combinations of buttons to see if i could get any response from the tablet, I've unbricked several cell phones that way and figured what do i have to lose and went into F***it mode, pissed at my brick.... anyhow long story short Here is the combination that fixed it - (I bricked my tablet again just to test my notes on the process)

1. start with screen on - stuck on sylvania
2. press and hold the power button & reset button at the same time,10seconds
3. hold down the home button, power button and the screen, you will see the infoTMIC screen pop up --- Don't let go!
4. it will bring up the system recovery screen, when you release the screen goes blank, tap the home button the screen will come back up
(side note, it will say on the bottom of the screen "Can't open / cache/recovery/command: no such file or directory" -- even though it really is there)
5.navigate down the list using the volume keys, press the menu button to select "wipe data/factory reset" --next screen select yes
7 disregard what it says at the bottom of the screen, the recovery worked
8.reboot the system
9. it will go back to the sylvania screen - animation working
10. take out the SD card -leave the tablet on, do not turn off- you will here a beep, put the SD card back in, it will finish booting
11. Your system is now back to its factory state, primped and primed ready to go"

Thanks for the help. When I hold down power and reset button at the same time, nothing happens =( the device just turns off and that's all. I tried that at both the stuck splash screen and when the device is off, still no luck =[ also tried holding down home button, power, button, or any combo with the volume keys, but nothing happens

[mastermind278]

Tell me what you get when you do
'cat proc/partitions' via adb.

1|root@android:/ # cat /proc/partitions
cat /proc/partitions
major minor #blocks name


93 0 16384 nanda
93 8 2048 nandb
93 16 32768 nandc
93 24 524288 nandd
93 32 1048576 nande
93 40 1024 nandf
93 48 32768 nandg
93 56 131072 nandh
93 64 2101248 nandi

Maybe we can figure out what partition has what needs to be changed.

Then you can try on adb 'mount'

root@android:/dev/block # mount
mount
rootfs / rootfs rw 0 0
tmpfs /dev tmpfs rw,nosuid,relatime,mode=755 0 0
devpts /dev/pts devpts rw,relatime,mode=600,ptmxmode=000 0 0
proc /proc proc rw,relatime 0 0
sysfs /sys sysfs rw,relatime 0 0
tmpfs /mnt/asec tmpfs rw,relatime,mode=755,gid=1000 0 0
tmpfs /mnt/obb tmpfs rw,relatime,mode=755,gid=1000 0 0
/dev/block/nandd /system ext4 rw,nodev,noatime,user_xattr,barrier=0,data=ordered
0 0
/dev/block/nande /data ext4 rw,nosuid,nodev,noatime,user_xattr,barrier=0,journ al
_checksum,data=ordered,noauto_da_alloc 0 0
/dev/block/nandh /cache ext4 rw,nosuid,nodev,noatime,user_xattr,barrier=0,journ a
l_checksum,data=ordered,noauto_da_alloc 0 0
/dev/block/vold/93:64 /mnt/sdcard vfat rw,dirsync,nosuid,nodev,noexec,relatime,u
id=1000,gid=1015,fmask=0000,dmask=0000,allow_utime =0022,codepage=cp437,iocharset
=ascii,shortname=mixed,utf8,errors=remount-ro 0 0
/dev/block/vold/93:64 /mnt/secure/asec vfat rw,dirsync,nosuid,nodev,noexec,relat
ime,uid=1000,gid=1015,fmask=0000,dmask=0000,allow_ utime=0022,codepage=cp437,ioch
arset=ascii,shortname=mixed,utf8,errors=remount-ro 0 0
tmpfs /mnt/sdcard/.android_secure tmpfs ro,relatime,size=0k,mode=000 0 0

nandd = /system
nande = /data
nandh = /cache

Humm, I think now I am going out of my league in terms of knowledge... just throwing information out there at this point.

---
Also can you verify that the proper kernel got installed?

On mine it shows up as 3.0.3+ xcy@xcy-desktop #11

[c19932]

root@android:/ # cat /proc/partitions
cat /proc/partitions
major minor #blocks name


93 0 16384 nanda
93 8 2048 nandb
93 16 32768 nandc
93 24 262144 nandd
93 32 1228800 nande
93 40 1024 nandf
93 48 32768 nandg
93 56 131072 nandh
93 64 2183168 nandi

[mastermind278]

Awesome, so this narrows it down to some type of issue in

nandd --> System... the size is off but you mentioned as to why...
nande --> I don't think it is an issue since it's the Data partition and that is always erased via Factory reset.
nandi --> ??? No Idea

[c19932]

found this regarding partitions.. Android/partitions - linux-sunxi

"Allwinner changed the layout a little some time after changing to Android ICS 4.0. Previous versions of the Android firmware would use partition with field "user_type" of 0 or 2. However, Allwinner appear to have added type 1."
The following is the partition layout from Mele-v1.3BETA Android firmware:

id	dev/block/*	Size	Name	Type	Description
0	nanda	16MiB	bootloader	vfat	Files to assist the bootloader. Think battery status images etc. also u-boot.bin, script.bin and .ini lives here
1	nandb	16MiB	env	raw	Enviroment to assist u-boot.
2	nandc	32MiB	boot	raw	Holds the kernel (and its ramdisk) in ANDROID mkbootimg form
3	nandd	512MiB	system	ext4	Android's /system partition
4	nande	1.5GiB	data	ext4	Android /data partition
5	nandf	16MiB	misc	raw	Partition used to pass data amongst various stages of the boot chain (e.g. boot into recovery mode, fastboot etc)
6	nandg	32MiB	recovery	raw	Android's recovery partition
7	nandh	128MiB	cache	ext4	Mounted as /cache and appear to contain backup information
8	nandi	16MiB	private	vfat	Mounted as /mnt/private
9	nandj	512MiB	sysrecovery	raw
10	nandk	944MiB	UDISK	vfat	Mounted by vold as /mnt/sdcard and /mnt/secure/asec

[c19932]

is there any way to find out kernel version through adb? since my touch screen doesn't work, I can't navigate through the settings menu.

[mastermind278]

is there any way to find out kernel version through adb? since my touch screen doesn't work, I can't navigate through the settings menu.

I remember reading about this on XDA, just tried it out and works well: xda-developers - View Single Post - Adb Rapid Tool

[c19932]

I remember reading about this on XDA, just tried it out and works well: xda-developers - View Single Post - Adb Rapid Tool

thanks. I double checked and I do indeed have the right kernel.
I was reading up on this:
[FIX][GUIDE] Fixing broken Wifi, G-Sensor, etc.

but I guess it wouldn't help in our situation right? Since my boot.img and everything in my system/vendor/modules folder would be the same as yours?


EDIT:

also i noticed something really weird. After rebooting the tablet twice, in the "about tablet" menu, the model number is now M701C instead of CMP741e, and the build number is also something other than what the stock rom is supposed to be. I am guessing that these model number and build number corresponds to the original firmware image that I flashed... but I did totally formatted /system before performing the nandroid restore. Upon the first reboot, I did double check and the model number WAS cmp741e. somehow they just changed. Where are they coming from?!