Help with Cadash

[Whipon]

As i said I use to play Genesis in my N-Gage QD. The emulator I use is Picodrive. It has no support for GG or PAR yet. So the only way to enter codes is to hack them in to the rom. Thats why I need a Master Code. In some games fixing the Checksum fix the problem, but now I'm having trouble with this one: Cadash (JU) [c][!] :

After fixing the checksum it keeps doing the same: a black screen.
So I tried to do the trace trick in HazeMD:

Good Trace:

  (loops for 262146 instructions)

00034C: lea     $18e.w, A0
000350: andi.l  #$ffff, D1
000356: cmp.w   (A0), D1
000358: bne     $846
00035C: nop
00035E: nop
000360: lea     $ff0200.l, A1
000366: move.w  #$3, D1
00036A: clr.l   (A1)+
00036C: dbra    D1, $36a
00036A: clr.l   (A1)+
00036C: dbra    D1, $36a

Bad Trace:

   (loops for 262146 instructions)

00034C: lea     $18e.w, A0
000350: andi.l  #$ffff, D1
000356: cmp.w   (A0), D1
000358: bne     $846
000846: moveq   #$3f, D7
000848: move.w  #$e, $c00000.l
000850: dbra    D7, $848
000848: move.w  #$e, $c00000.l
000850: dbra    D7, $848

So It seems that I must modify the BNE at 358. If I change it to a NOP (4E71) It shows the Sega Logo, but then freezes in a black screen. Same result with RTS (4E75) and a bunch of branchs (60xx) combinations from 6000 to 6012.

Whats wrong?.

[Whipon]

Well, it seems the master code is
000358:6002.

I don't know why it doesn't work before, but I found the following:
This rom has a bad checksum. It works perfectly. But if you fix it it stop working, no matter if you use the Master Code or not.
Thats all.
Whipon.