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Thanks I think I found the doc you meant at
http://psp3d.com/showthread.php?t=3709

Hi I am created a dump of the boot code, I am presuming that it has not been changed once the system starts (0xBFC00000 to 0xBFC10000). I am just trying to understand what it is doing. BFC00000: ctc0 v0, 6 BFC00004: mfc0 v0, Unknown 22 BFC00008: bnez v0, BFC00040 BFC0000C: nop BFC00010: cfc0 v0, 9 B...

I was looking at the ~psp file from the upgrade (1.5) from what I can understand of the headers it is uncompressed. But is this just plain mips code and from where does it start. I would like to have a look at the dissabled code.