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Help to backup Allwinner firmware

Help to backup Allwinner firmware

Windows Vista
Windows Vista
Windows Vista
Junior Member
27
03-12-2022, 04:20 AM
#1



Hi there, I currently own a Ghia A7 (GA7133N) tablet powered by a Allwinner A133 processor and I'd like to install a GSI on it, but the problem is that I can't find a working method for doing a firmware backup of it (just in case something goes wrong during the flashing process) ...

Any suggestion will be highly appreciated ?
maxpayne
maxpayne
maxpayne
Intern
3,602
05-12-2022, 03:00 PM
#2
(03-12-2022, 04:20 AM)Windows Vista Hi there, I currently own a Ghia A7 (GA7133N) tablet powered by a Allwinner A133 processor and I'd like to install a GSI on it, but the problem is that I can't find a working method for doing a firmware backup of it (just in case something goes wrong during the flashing process) ...

Any suggestion will be highly appreciated ?

Is it rooted with unlocked bootloader?

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Windows Vista
Windows Vista
Windows Vista
Junior Member
27
05-12-2022, 03:10 PM
#3
(05-12-2022, 03:00 PM)maxpayne
(03-12-2022, 04:20 AM)Windows Vista Hi there, I currently own a Ghia A7 (GA7133N) tablet powered by a Allwinner A133 processor and I'd like to install a GSI on it, but the problem is that I can't find a working method for doing a firmware backup of it (just in case something goes wrong during the flashing process) ...

Any suggestion will be highly appreciated ?

Is it rooted with unlocked bootloader?

No, I can unlock the bootloader but I need the boot image to root it, which I don't have because I don't have the firmware
maxpayne
maxpayne
maxpayne
Intern
3,602
06-12-2022, 08:07 AM
#4
(05-12-2022, 03:10 PM)Windows Vista No, I can unlock the bootloader but I need the boot image to root it, which I don't have because I don't have the firmware

Try this adb script (ignore the model name it shows)
Attached Files
.zip
allwinner_firmware_dump_script_tool.zip
Size: 164.4 KB / Downloads: 59

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Windows Vista
Windows Vista
Windows Vista
Junior Member
27
16-12-2022, 12:59 AM
#5



(06-12-2022, 08:07 AM)maxpayne
(05-12-2022, 03:10 PM)Windows Vista No, I can unlock the bootloader but I need the boot image to root it, which I don't have because I don't have the firmware

Try this adb script (ignore the model name it shows)

In my case it didn't work, but here's how i successfully dumped the boot image (i basically lost the stock rom in the process):
i unlocked the bootloader the usual way (fastboot oem unlock) and then i flashed a rooted phh gsi and when it booted i used this command to dump some partitions including boot;
Code:

dd if=/dev/block/mmcblk0p5 of=/sdcard/boot.img
nmajin
nmajin
nmajin
Newbie
2
15-08-2023, 03:53 AM
#6
(16-12-2022, 12:59 AM)Windows Vista
(06-12-2022, 08:07 AM)maxpayne
(05-12-2022, 03:10 PM)Windows Vista No, I can unlock the bootloader but I need the boot image to root it, which I don't have because I don't have the firmware

Try this adb script (ignore the model name it shows)

In my case it didn't work, but here's how i successfully dumped the boot image (i basically lost the stock rom in the process):
i unlocked the bootloader the usual way (fastboot oem unlock) and then i flashed a rooted phh gsi and when it booted i used this command to dump some partitions including boot;
Code:

dd if=/dev/block/mmcblk0p5 of=/sdcard/boot.img

I also have an Allwinner A133 tablet, how did you end up getting fastboot working? I cannot get my PC to find the driver for the "USB Developer" device and therefore cannot unlock the bootloader. I can get the commands for fastboot to work in fastbootd but I get an issue with HAL when trying to unlock the bootloader there, which also sounds like something that should not be done anyway.
Neutr0
Neutr0
Neutr0
Newbie
2
06-07-2024, 05:49 PM
#7
I have the Pritom B8 Allwinner a133 tablet and unfortunately the manufacturer does not provide stock rom and usb drivers on the website.
I got the adb driver from the Teclast website, which offers good support for its tablets and the Teclast P25T (CODE P9B1) has the Allwinner A133 chipset.
I downloaded the Teclast P25T firmware and the firmware file contains the correct driver for devices with the Allwinner A133 chipset.
I recommend using a good quality cable that connects directly to the computer's motherboard so that the adb connection does not fail.
Neutr0
Neutr0
Neutr0
Newbie
2
06-07-2024, 06:06 PM
#8
After unlocking the bootloader it is easy to dump all the files (in case there is no place to download the stock firmware on the manufacturer's website like in my case) or just the ones needed to root magisk using the boot_a file which becomes the boot .img by dumping and patching the magisk application.
Doing TWRP is complicated as there is little documentation about this chipset in the forums, I am contributing to the support of this site to find out how the recovery works on this Allwinner chipset and in the future the site's twrp online build tool will support this chipset.
I recommend using the adbDumper tool available on the xda forum, after the bootloader is unlocked and USB debugging works correctly in adb on the computer, you can now use this tool that automates the backup of your device's firmware.
This post was last modified: 06-07-2024, 06:11 PM by Neutr0.
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