PS2Ident VS CheatDevicePS2

FreeDVDBoot works on SCPH-90000 series. Go to this link and follow the instructions under "Easy setup for all PS2 Slim consoles / Bravia TV". You should boot to homebrew uLaunchELF. If this works, then your PS2 laser can read burned media AND you can use uLaunchELF to run ps2ident or the FMCB installer off of a flash drive. PS2Ident would tell you whether your BIOS is 2.20 (FMCB will work) or 2.30 (FMCB will not). Fortuna can be used on 2.30 versions (google FunTuna).

Sometimes, Sony makes hardware revisions without changing the chip implementation numbers as well, hence why chip identification may be inaccurate. The chip and version IDs are, however, accurate since they are taken directly from the hardware. https://github.com/ps2homebrew/PS2Ident

Q5: There is definately a lot of interesting homebrew software for the ps2. it isn't an emulation beast like the xbox or wii but there is RetroArch, SNESticle, PicoDrive, and some other stuff like. https://www.psx-place.com/forums/emulators.213/ The coolest thing IMO is using cheats to do widescreen fixes. OPL has support for cheats and you can use CheatDevice https://github.com/root670/CheatDevicePS2/ for discs (but it also works for OPL)

I use cheat device for cheats. It works with discs and OPL and is very easy to use.

It wouldn't help run that disc but fmcb would allow you to use homebrew cheats, such as cheat device

For now, the workaround is using root670's CheatDevice, which means you have to run it first everytime you want to play Jak series on OPL. Inconvenient, I know.