[Black Swirl of the Dead] Problem after change regionfree bios

[dragoncity]

Hello !

The first time I use region changer..no problem..but second time...Black Swirl of the Dead...


So For repare that..I put this bios "jc-bootROM-devkit-v1.031.bin".

So it's ok...but not PERFECT !

The 1rst problem,many games can't stay in 60hz,so I have just "Half the screen" like Resident Evil Code Veronica.

The 2nd problem,many games don't boot..Shenmue 1&2 for exemple.

The 3rd problem,I need to put 01/01/1950..

So there is an other solution to have a Dreamcast who works perfectly with an other bios..or anything else?

Thank you !