I used SoftDev2 because FHDB isn't compatible with the Modbo 5.0 chip and PS2BBL can't launch OSDSYS.
SoftDev2 can launch OSDSYS, but somehow it makes it impossible to launch discs. The browser can detect discs, but selecting it result in a reloading of OSDSYS (and SoftDev2), ending in OPL instead of booting the inserted disc...
It is a Sony network adapter with a P-ATA disc. But PS.BBN is not so flexible. The newest installer uses APA-Jail and reserves a fixed 128GB for APA, only the rest is exFAT for games. 128GB is a big chuck on the 160GB drive. Also, exFAT game installing over the network is slow using NBD, less then 1MB/s.
APA game installing is a acceptable 7-8MB/s using HDLGameInstaller or 4-5MB/s using HDLDump and both work on Linux But if using APA games with PS.BBN it requires install using a Windows-only script and it's using slow NBD
------
But, for now I found a workaround for booting PS1 and PS2 discs with SoftDev2 installed: install HDD-OSD. Then SoftDev2 launches HDD-OSD instead of OSDSYS when holding triangle. With that browser version both PS1/PS2 discs boots fine
Maybe SoftDev2 only patches OSDSYS (unintentionally making it not booting discs) and not HDD-OSD?