I just ran in to the same problem as you imap, stuck with stock 1.1.2. The only thing I can think of is that in some of the earlier iphone updates (1.01 and 1.02), the files were named "iPhone1,1_1.0.1_1A543a_to_1C25_Update.ipsw" and "iPhone1,1_1.0.2_1C25_to_1C28_Update.ipsw", respectively. Has anyone ever seen or heard of a file like that ending with "Update" rather than "restore" for the 1.1.2 software?
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