Scatter File

To use the SP Flash tool you need to have a scatter file. One easy way to find that is to look out for other devices that use the same chipset but the manufacturer releases the firmware file including the scatter file one such manufacturer is Xiaomi but you may find other manufacturers as well.

Samsung Galaxy A34 uses Dimensity 1080[MT6877v] and here is the list of other devices that use this chip as well:

• Doogee V Max
• Doogee V30T
• Doogee V31 GT
• Infinix Zero 5G
• Realme 10 Pro+ 5G
• Xiaomi Redmi Note 12 Pro 5G: Download Fastboot

UFS Or eMMC

Devices come in two kinds, eMMC and UFS. eMMC is just an SD card but in a package of a chip which then is called an embedded SD card or eMMC. Others come with UFS storage which is NAND flash in fancy words. You can determine your device type by looking at the specs. For A34 that is UFS 2.2.

Partition Starting Address

There’s a PIT (Partition Information Table) file inside all Samsung firmware. This file includes all partition starting addresses. Don’t know how to read it yet though

Small Notes

1. If you are creating a scatter file from scratch know that you should put all partition inside and all correct start addresses. SP Flash Tool every time you flash even a single partition will update the device gpt partition table based on the scatter file you supplied thus be careful or backup the ptable before starting messing around
2. Would be awesome if anyone knows a tool which can read the ptable, currently I used mtkclient but the support is not that great
3. SP Flash Tool By SRAM, By DRAM option, choose how the file was first copied to the device and then write to the actual location. Both should work in normal conditions, SRAM used if DRAM has issues, pro during R&D.

• Networking At Home – Restoring MTK based phones from Sp Flash Tool Readback image

Half of Samsung devices come with a MediaTek chip. These chips come with a special mode called BROM or emergency mode. This is something that by default is not enabled but if the device goes into broken mode it will activate to allow the device to be flashed without the need for a jtag connection.
There’s a tool called Android Utility Tool that comes with a very shitty support, website, and documentation. In my journey, I thought I give it a shot as the phone that I was playing with wasn’t so important to me. Unfortunately, I used the tool to put my device into the BROM mode and the device got bricked with a black screen and no reaction whatsoever.
The solution was easy just get a stock ROM extract Bootloader files uncompress the LZ4 file format and then use the write boot_section and write a preloader file to the device. And your device will work revive again.
Final note MediaTek mode only enables for a few seconds after you reboot the device so each time you want to execute an action you have to keep Holding the power button or some combination for a few seconds or more.

• XDA – Accidentally bricked my SM-S134DL (Samsung A03) with BROM
• XDA – Android Hacking General [Developers Only]
• XDA – Patch Samsung STOCK Recovery with fastbootd [Guide]
• Google – Android/Fast-Boot
• GitHub – WessellUrdata/VBMeta-Disable-Verification