OK, I made a successful phone call with my experimental phone, flashed it to Iode’ OS and back to Lunar OS-the IMEIs and Serial No survived that. I must have done a format on SP Flash. I know now to NEVER do that. I did firmware upgrade twice now and no problems.
The version of SN Writer linked in the Tools and Resources page works for Windows 10. Follow Media Tek’s how to guide and all works out.
Here’s some screenshots that may help:
I did have trouble getting SN Writer to flash. What u need to do is install the adb batch file so that Windows downloads adb and fastboot. Then make sure adb debugging is enabled on your phone and plug it into the Win pc. The phone will pop up a screen to enable adb from the computer-check always. Run cmd in the search box and put in adb devices to make sure all looks good. Here is the batch file u need:
https://opensource.braxtech.net/assets/files/Latest-ADB-Installer.bat
Now proceed with the SN Writer! 