PS2 Manual installation guide for PSX games in the APP section of OPL via USB.

[Andiweli]

You need bdmAssault because exfat.

Thanks got it running the last hour with it...

 

[gamerman 5000]

Is there a solution for "It just takes me to the same screen LaunchELF 4.43X_ISR"?

I am using OPL 1.2.0 Beta-2082 and a 256GB ExFAT Card.
PS2 ISOs are working, I also can see the PS1 games with covers, but after a short loading time I am back in LaunchELF 4.43 ISR.
Loading with LaunchELF also opens LaunchELF again after a few seconds.

I used POPStarterGameInstallerforOPL 1.0.0.1.

Any idea?

Popstarter does not support exfat, do what @Ripto says or format your drive to FAT32.