PS2 DTL-H50000 (J) PS1 games not region free

[shownomercyomer]

North American SCPH 50001 PS2s have full region unlock for both PS2 and PS1 games when mechapwn'd from consumer to developer mode.

The Japanese SCPH 50000 have full region unlock for PS2 games but not PS1 games.
PS1 games remain region locked to Japan.

Why is this?
Is there a workaround or fix to this?

 

[BloodRaynare]

https://github.com/AkuHak/MechaPwn?...soles-not-play-ntscpal-discs-on-fat2-and-70k3
Though it seems on your case it only applies to PS1 games?

 

[shownomercyomer]

Thank you , that answered my question. And yes only ps1 games on NTSCJ 50000 console remain region locked (and DVD movies)

"Why do PAL/NTSC-J consoles not play NTSC/PAL discs (on FAT and 70k)?

The IOP ROM on those consoles has enforced strict logo decryption checks both in the PS1 and PS2 BOOTROM that the NTSC-U (also used in ASIA consoles) BOOTROM does not have."