Attention - this quick guide is only intended for experienced users. Use at your own risk!
Download SP Flashtool: https://spflashtool.com/
Steps:
1. disconnect the USB cable from the device (battery charge at least 50%)
2. shut down the "Phone" (power off)
3. open SPFlashTool (version 5.xxx, not version 6.xxx)
4. Select the path to scatter.txt in the SPFlashTool (from https://volla.tech/filedump/vollaos/vol ... mameid.zip )
5. select "Firmware update" from the drop-down menu
6. click on DOWNLOAD (green arrow symbol pointing downwards)
7. quickly connect the device to the PC/laptop with the USB cable, the flash process should start automatically after a few seconds
8. wait until the process is complete
9. unplug the device from the USB cable
10. start the device