I have an (older, shows v2 on board) 2.6" module with 2MB flash that was updated to V3.9C.  I tried to upgrade to any newer version, including V5.0 using the "manual" reset method and it seems to work but resets to an all white screen.  Here are my steps:

1. Connect to PC using FT232 adapter (set for 5V operation) with RX-->CLK and DATA-->GND

2. Run RealTerm on Win10 set to 57600 baud as indicated in instructions

3. Short the button pads as indicated in instructions until I get an "S" in Realterm

4. Reconnect TX-->DATA and use RealTerrm "send file" command to send 2IN6_FLASH_V5V.hex file.  I tried with XON/XOFF and with 10ms delayed send separately

5. As soon as download starts, a "Y" is displayed next to the "S" in RealTerm

6. Once file send completes, RealTerm shows a "G" next to the "SY".  So now it shows "SYG"

The display resets and shows a White screen only.  Sending a clear display command does nothing and sending "DC1" does not cause the display to show the info screen on bootup.  I have tried firmware V40V and V42V with the same results.

I cannot find firmware V3.9C to regress so what should I do next?

If you are in Canada, the simplest way is to mail the display to our service dept. by using oversized mail (postage only $1.94) to have us to recover the damaged firmware.

 Great, will do.  Thanks!