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MagicianUpgradeFiles
This document describes the new stile update files:
The NBF file is composed by a 172 bytes header (which is base64-like encoded), and by the encrypted rom data. The pseudo-base64 alphabet is: "yz98765432UVWXYZabcdKLMNOPQRSTopqrstuvwxefghijklmnABCDEFGHIJ10"
Header format (after decoding):
| 0000 | deviceid ( PM10x ) x=A,B,C,.. |
| 0010 | operator |
| 0020 | language |
| 0028 | version |
| 0038 | devicename ( Magician ) |
| 0048 | length |
| 0050 | startoffset |
| 0058 | endoffset |
| 0060 | unused |
| 0078 | checksum |
The "encryption" algorithm is very simple: each dword is XOR'ed with the previous ENCODED dword. That is, even without knowing the XOR seed you can decode all the file except the first dword (which, up to date is the same in all the versions of each file).
The attachment is a perl script which decodes the header and decrypts the rom data.
