Thanks to AI like Gemini and Claude Opus, a person like me who doesn't know anything about coding can add more mappers to PocketNES. Take a look: https://github.com/GamingFanboy365/pocketnes
Edit: now also working on a spinoff titled PocketVT...
Not working for me either. EZ-Flash ODE running on SimpleDE's source. White screen when trying to launch a ROM.
Update: I tried the file (.mb) you uploaded under the issue on github and it works!