[Android General] Shreps:
[GUIDE] Flash/Unbrick with a SPFT Firmware

Flash a full Firmware with SPFT (back to original / unbrick)

Devices compatible with this Guide :

A1-713

A1-713HD

A3-A20

A3-A20FHD

Downloads

SP Flash Tool

SP_Flash_Tool_exe_Windows_v5.1352.01.zip for A1-713 & A1-713HD

SP_Flash_Tool_exe_Windows_v5.1352.01.zip for A3-A20 & A3-A20FHD

Firmwares

A1-713 - Acer_AV0K0_A1-713_RV02RC05_WW_GEN1.zip

A1-713HD | KK | http://cutt.us/nCgXD | a3bc62c9c34c148d21bc977ed81672aa | AV0K0_A1-713HD_RV05RC03_WW_GEN1

A3-A20 | KK | http://cutt.us/mCakd | d4e034d871df6b9cddf60ea7332e8dc3 | AV0K0_A3-A20_1.018.00_WW_GEN1

A3-A20FHD| KK | http://cutt.us/e5Smh | 9b3c816da5e843a90c1c8a16af14d44b | AV0K0_A3-A20FHD_1.023.00_WW_GEN1

Drivers

Download MTK Drivers : MTK_SP_Drivers_v1.4.rar (last one unsigned) or MTK_Signed_Drivers.zip (older but signed for Windows 8)

Open your Windows device manager

Remove your battery from your device, or unplug it, or make sure your device if off

Plug your device to your PC with USB cable (a good cable, on a direct back USB port, avoid front USB ports)

A "MTxx Preloader" device should appears for a few seconds, install drivers for it

Unplug, replug the USB cable, your device should be well regconized (a COM device in USB Ports & Com)

Flash the firmware

Download the Firmware archive and the SP Flash tool for your device

Unzip both SPFT and Firmware archives

Run flash_tool.exe has an administrator

The program can prompt that a scatter file is required, click on OK.

Click on "Scatter-loading" and choose the scatter MTxxx_Android_scatter_emmc.txt file from the Rework-Secro directory under the Firmware directory

You should have something like :

Make sure only SEC_RO partition is checked, you're in "Download Only" mode and click on "Download": SPFT is now waiting for a device a COM port to Flash

/!\Remember never use the Format pattern to download versions.

Remove your battery from your device, or unplug it, or make sure your device if off

Plug your device to your PC with USB cable (a good cable, on a direct back USB port, avoid front USB ports)

The flashing process will start automatically : do not unplug your USB cable !

Wait for a Green Circle saying the flash process is finished

/!\ Do NOT power on your device, it must be stay off

Now, Click on "Scatter-loading" and choose the scatter MTxxx_Android_scatter_emmc.txt file from the root Firmware directory

You should have something like :

/!\ It's recommended to uncheck the "PRELOADER" partition, you can try to make the process with this checked only if it failed before while unchecked.

Make sure the download pattern is “Firmware Upgrade”, and the firmware secro-sign.img is used instead of secro-sign.img from the previous folder

Click on "Download" : SPFT is now waiting for a device a COM port to Flash

Remove your battery from your device, or unplug it, or make sure your device if off

Plug your device to your PC with USB cable (a good cable, on a direct back USB port, avoid front USB ports)

The flashing process will start automatically : do not unplug your USB cable !

A red bar for COM loading, a purple bar for Preloader Flashing, a yellow bar for Firmware flashing

Wait for a Green Circle saying the flash process is finished

Close SPFT, unplug USB Cable, put back your battery, charge your device for 10min, try to boot it

And your device is back ;)