Fails to successfully talk to certain cartridges (Pokemon B/W 2)

[kitlith]

In this case, there's a 0 byte at the beginning, 0x40 0xFF bytes, before continuing with the regular header bytes for that area, offset by one byte. Wrong timings?

ChipID: c2fe01c0
Mangled header for examination: https://up1.secretalgorithm.com/#SFMmaQeY2-KOa1N0d5oyMA
Haven't bothered to pull off an untouched header from the cart yet, but when I do, it will go here.