Thanks to Randy Stiver who sent me a V3 I could test on, I was able to add support for the new LCD to the open-source firmware.
seeedstudio.com/wiki/DSO_Nano/Development
The firmware must be built specifically for the V3 by using “make NANOV3=1” where the instructions say just “make”. Maybe some day the firmware can be improved to detect the right LCD code automatically. And support the 2MB memory… Happy hacking! 