Copyright (C) 2007-2011 pancake Copyright (C) 2011-2012 Pali Rohár SPECS FOR THE FIASCO FIRMWARE FILE FORMAT ffff! ----------------------------------------------- This is final working version of FIASCO format. FIASCO image which is generated by this spec is acceptable by Nokia flasher-3.5 and unpack data same as FIASO image generated by Nokia fiasco-gen. This format is implemented in 0xFFFF and every image which I tested (generated by 0xFFFF and fiasco-gen) was properly unpacked under 0xFFFF and flasher-3.5 with same result. Small difference is that fiasco-gen add some unknown subsection block to image header (type '4' or '/') which contains some messy characters... But if these sections missing, flasher-3.5 working fine too. And old FIASCO images (for N8x0) does not have these subsectin... FILE HEADER 1 byte = 0xb4 -- signature 4 bytes -- FW header length (big endian) FW HEADER 4 bytes -- number of FW header blocks (big endian) block { 1 byte -- type of block 0xE8 - Fiasco name 0x31 - FW name 1 byte -- length of block data N bytes -- block data } IMAGE 1 byte = 0x54 -- signature 1 byte -- number of subsection blocks + 1 5 bytes -- unknown (always 0x2e 0x19 0x01 0x01 0x00) 2 bytes -- checksum for the image contents (xorpair) (big endian) 12 bytes -- image name type (first byte is FF if is the last image) 4 bytes -- length of image data (big endian) 4 bytes -- unknown (always 0x00 0x00 0x00 0x00) block { 1 byte -- type of subsection block '1' - version '2' - device & hw revisions (size of device is 16, hw revision 8) '3' - layout '4' - unknown '/' - unknown 1 byte -- length of subsection block N bytes -- subsection block data } 1 byte -- unknown (0x00 is accepted, maybe end of subsections?) N bytes -- image data