This guide requires Microsoft Windows to follow

This procedure will wipe all data on the device

This guide is based on this XDA post

Prerequisites

• You have an S3 X626 make sure it is the X626 model
• The phone does not visibly respond to any button presses
• You have a Windows PC

Preparations

1. Download the original firmware
2. Download the unbricking tools
3. Unpack and install the drivers from MediaTek_Preloader_USB_VCOM_Drivers_Setup_Signed.zip

Flashing the firmware

Note: you might notice that the files say X620 instead of X626, but these are, in fact, the right files

1. Unpack SP_Flash_Tool_v5.1628_X620.zip into any folder
2. Unpack LeEco_x620_SP_Rom.androidbrick.7z into any folder
3. Run SP_Flash_Tool_v5.1628_X620\flash_tool.exe and wait for it to open
4. Press <Ctrl + Alt + s>. New fields should appear
5. Input the right files into the fields (select by pressing the folder icon to the right of it):
   • Download agent: SP_Flash_Tool_v5.1628_X620\secureboot\DA_BL_HIGH.bin
   • Scatter-loading file: LeEco_x620_SP_Rom.androidbrick\MT6797_Android_scatter.txt
   • Authentication file: SP_Flash_Tool_v5.1628_X620\secureboot\auth_sv5_letv.auth
   • Certification file: blank
6. Make sure that the dropdown below these fields says "Download Only"
7. Check that the "Location" column in the table below is filled in for every row
8. Below that, deselect the checkboxes for "recovery" and "boot"
9. Unplug the phone from the PC (do noting if it wasn't plugged in before that)
10. Press the "Download" button
11. Plug the phone back in
12. Wait for the flashing to start (it may take a few minutes)
13. If you get "BROM ERROR: STATUS_COM_PORT_OPEN_FAIL (0x3F5)"
14. Unplug the phone
15. Hold "power" and "volume -" buttons
16. Plug the phone back in
17. Try again from step 10 (while holding the "volume -" button)

Flashing "boot" and "recovery"

1. You should still be in SP Flash Tool
2. Press <Ctrl + Alt + v>
3. In the menu bar select "Window" > "Write Memory"
4. Input the right files into the fields:
   • File Path (select by pressing the folder icon to the right of it): LeEco_x620_SP_Rom.androidbrick\boot-verified.img
   • Begin address (HEX): "0xf900000"
   • Region: "EMMC_USER" (default)
5. Press "Write memory"
6. If the process doesn't start
   • Unplug the phone
   • Hold "volume +" button
   • Plug the phone back in (holding the "volume +" button)
7. Repeat steps 4-6, but with different values:
   • File Path (select by pressing the folder icon to the right of it): LeEco_x620_SP_Rom.androidbrick\recovery_stock_works _after_brick.img
   • Begin address (HEX): "0x8000"
   • Region: "EMMC_USER" (default)
8. After that the phone should successfully boot, but with the screen orientation reversed
9. You may now close SP Flash Tool as it will no longer be needed

Putting the phone into fastboot mode

1. Hold down the power button until the phone powers off
2. Hold down the "volume +" button
3. Hold down the "power" button (without releasing "volume +")
4. The phone should now enter fastboot mode (in the middle of the screen there should be three grey gears)
5. If unsuccessfull, repeat from step 1

Flashing stock ROM

1. Unpack LeX626_Fastboot_5.9.023S.rar into any folder
2. Press <Shift + Right Click> in the folder where you unpacked LeX626_Fastboot_5.9.023S.rar (that folder should contain fastboot.exe)
3. Select "Open command prompt here"
4. If it is not available
   • Select "Open PowerShell here"
   • Type "cmd" and press <Enter>
5. Plug the phone into the computer
6. Run fastboot oem unlock
7. If stuck at "<waiting for devices>"
   • Unpack Fastboot-20250123T082851Z-001.zip into any folder
   • Follow this fastboot installation guide
   • Repeat from step 6
8. Enter the following commands
   • fastboot flash lk images/lk.bin
   • fastboot flash lk2 images/lk.bin
   • fastboot flash logo images/logo.bin
   • fastboot flash tee1 images/trustzone.bin
   • fastboot flash tee2 images/trustzone.bin
   • fastboot flash md1img images/md1rom.img
   • fastboot flash md1dsp images/md1dsp.img
   • fastboot flash md1arm7 images/md1arm7.img
   • fastboot flash md3img images/md3rom.img
   • fastboot flash scp1 images/tinysys-scp.bin
   • fastboot flash scp2 images/tinysys-scp.bin
   • fastboot flash boot images/boot.img
   • fastboot flash -S 16M system images/system.img
   (this one will take a long time, and even if it seems like it's stuck, **do not interrupt it**)
   • fastboot flash -S 16M userdata images/userdata.img
   (see previous command)
9. Run fastboot reboot
10. Enjoy your unbricked LeEco Le S3 X626 (mandatory)