MiyooCFW VS simplemenu

Try getting a second SD card and flashing it with the Miyoo cfw from here. It's probably something corrupted on the card.

And/or just install one of the nightly builds yourself and see what issues you find. They can be found under the actions tab on github, although I think you have to be logged in to actually see the download: https://github.com/TriForceX/MiyooCFW/actions/workflows/build.yml

Generally speaking RetroArch allows installing and removing cores, but no clue how it works on this device and what the steps are if its possible. This article or tutorial might interest you: https://github.com/TriForceX/MiyooCFW/wiki/RetroArch-Setup I think you should be able to download a core from this place https://buildbot.libretro.com/nightly/dingux/miyoo-arm32/latest/ and just put it into the cores folder in RetroArch on your device. But there might be additional steps needed to integrate them into the system, not sure at this point. BTW you should have added the name of the device into the post title. Such generic titles aren't helpful.

I have used already the cfw for this model https://github.com/TriForceX/MiyooCFW/actions/runs/4988520114

I've followed the "Instructions for a fresh install on Miyoo consoles" from here: https://github.com/fgl82/simplemenu/releases but I don't seem to be getting the same workflow.

There's some software modifications you can make on the V90 to take away some of the jank, but there will always be a little given how low-power the device is. On mine, I have the Miyoo CFW installed along with SimpleMenu and RetroArch (links to Miyoo download) and it makes it nicer to play on.

Did they discontinue support for simple menu on the rg 350? There download location 404s , and if you go directly to the simple menu site it has only one listed "SimpleMenu-RFW.opk" here https://github.com/fgl82/simplemenu/releases

You create a new .ini file in the section_groups folder with the sections you want to be displayed in that file, and that gets picked up by Simplemenu. For the background image, just add a PNG file with the same filename as the ini file, like shown here.

Yes. You need to customize the appropriate .INI file in SimpleMenu's section_groups folder. Its not too difficult, just requires you to get your RG device connected to your PC, setup a SCP connection to 10.0.0.2 and edit the file. The github page has the information you need to get connected. The SimpleMenu wiki has instructions on how to customize section_groups.