I don't have enough of a sample size to fully determine WTF is going here. When I boot HDLoader or Action Replay from disc and swap in a backup to boot/rip my v9 with a Modbo 1.99 installed refuses to allow either application to recognize the disc as legitimate. With a v7 I previously owned that sported a Mars Pro chip it had absolutely no problem doing either and both applications fully recognized the discs as 'legitimate'.
What I can't decide is if this is a behavior of the v9, a behavior of the Modbo, or the behavior of the two together. I seem to recall having a v9 with a Mars Pro that had no trouble ripping backups using HDLoader. I wouldn't mind using a Mars Pro chip in my daily driver PS2 but I have a handful of PAL titles that the Modbo forces well into NTSC. Mars Pro flat out doesn't allow you to change the settings in its built in menu. Maybe I should go nuts and buy a DMS4 before they're all gone?
By backup I merely mean a properly made image was burnt to a DVD-R and verified as good. They will boot stand alone but I'd like to be able to access debug menus and what have you. The Action Replay is a disc I've owned for years so I know it isn't some odd copy protection - not that Datel would really care.