It will always "still work" on any system so long as it isn't the last line of PS2 slims Sony made as they removed the "exploit" in those models so FMCB will never work on those. There are easier methods now days if you have a phat PS2 and have a network adapter with HDD. This is the method I use now and removed FMCB altogether as it support Sony's official PS1 emulator to run games from the HDD as well as PS2 titles. Best thing about it is the actually forces PS1 games to run via component cables and always boot directly to Sony's official memory manager where all apps are installed like HDloader, uLaunch and many many more.
PS3 CECH-2501A [CFW] & CECH-3001 [OFW]/ PS2 SCPH-3901 & SCPH-7501/ PS Vita TV PCH-1000
MOD Custom Cobra 4.46 v7.00 w/ E3 Flasher [CFW] & Cobra ODE 4.53 [OFW]/ Mod HDD-OSD [Phat] & Modbo 4.0 [Slim] / FW 2.60 [TN-V]
HDD 1tb [CFW] & 640gb [OFW]/ HDD 640gb & OPL v0.92 w/ 1.5tb SMB /Memory 8gb & 32gb