I had it working just fine after adding a couple of roms and now after a second round of adding roms and bios files, it no longer works. Clicking on it within Steam OS just flashes to a black screen for a sec and then goes back to the OS without opening emulation station.
I searched a bit and found someone with a similar problem but the explanation to fix it made no sense as if it was written by someone who didn’t speak english and/or expects everyone to be hackerman rather than a normal human being. Here’s that post: https://www.reddit.com/r/SteamDeck/comments/u689e2/pcsx2_fix_blackscreen_and_close_emulator_after/.
Can someone please help by explaining this in English?
If you’re talking about EmulationStation itself not working, and not a specific emulator, then you can always run the installation script again to reinstall it on top of your non working install. If you’re referring specifically to PCSX2, then I know I had the issue previously… not sure how I fixed it though. I think it had something to do with the difference between the available emulators like PCSX2, PCSX2-QT, and the PCSX2 core in retroarch, and making sure I chose the right emulator to use.
Not vouching for the instructions, but the post at that link is pretty clear, and correct when it comes to revering a flatpak to a previous version. You don’t need to be a “hackerman” to copy-paste some console commands.