Ps2 logo mismatch with NTSC game on PAL console.
When i updated to OPL 1.2.0 Beta when ever i have PS2 Logo enabled i get a error when booting ISO. then the Debug Colour screen flashes, not sure if it boots into the game after the flashes because a reset back to menu, when i turn off the PS2 Logo option, the error message doesn't appear the Debug colour screen still shows up then the game will boot. am i missing a bios or is it something to do with my PAL console running NTSC games? or my TV perhaps?
What kind of an error (exactly) are you getting? What do you mean by "back to menu"? Which menu? OPL menu, FMCB menu, etc?
PS2 logo works on a PAL console with a PAL game or on a NTSC console with a NTSC game.
When this condition is fulfilled and the Debug colors are ON you should get this info:

It does NOT work on a PAL console with a NTSC game or on a NTSC console with a PAL game.
Then you will get:

I have checked OPL v1.2.0-Beta-1842-0406855 and I do NOT have this problem. Games are booting with or without PS2 logo, no matter the region.