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Henrik RydgårdandClaude Opus 5
8f9b2fc1b1
Written from reading 43 firmware versions, 1.50 through 6.61, while building the unpacker - most of it isn't obvious from the code, and several parts only show up if you look at more than one generation of updater. Covers the three shapes an updater arrives in, the archive header and the record layout, the two-step block decryption (KIRK CMD7 demangle, then an ordinary PRX blob), the entry fields, the compression formats, and the three different naming schemes with the DES-encrypted file lists that back two of them - including which key set goes with which firmware, though not the key material itself, which is already in the source. Ends with the gotchas that each cost a debugging round: walking by the length in the header rather than the file size, the slack the decrypter needs but the last record can't provide, not assuming which entry numbers are file lists, and the path spelling changing between generations. Everything in here was checked against an actual updater. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01GZq8ZtJmFY7bkX5FVkr3P9