![]() ![]() The HTPCode object contains Hardware Test Program, which can be loaded via BootExtension I am not sure this is actually used anywhere in code.ĭepending on the device, the following objects may be present: The termcap object contains what looks like, well, termcap description. The RomDefa object contains ROMFILE with default configuration settings. The RasCode object contains the OS image (named RAS - acronym?) - the final stage. BootExtension is responsible to load actual ZyNOS code. ![]() ![]() It also contains rudimentary debugging facilities allowing to recover the device in case of e.g. The BootExt object maps the BootExtension code - stage 2 program loader. BootBase is rather small, typically 16K, but then, it does not need to do much except loading stage 2. Apart from boot code, BootBase contains vendor and model names. It is not actually contained within the firmware update image, but I have seen a few firmware releases from ZyXEL that contain BootBase update in a separate file. The BootBas object maps the BootBase code - the initial program loader for the device. The MemMapT object maps the memory mapping table - its actual location and size in ROM. I used binwalk to extract the files HTPCode.rom and RasCode.rom.Īfter looking at the zynos.md, i find more informations about the extracted files Memory mapping and objectsĪll inspected devices so far contain at least these objects: MemMapT, BootBas, BootExt, RasCode, RomDefa, termcap. rw-r-r- 1 root root 28 Sep 30 03:33 RasCode rw-r-r- 1 root root 28 Sep 30 03:33 HTPCode I used the script zynos.py for unpacking the firmware and i got some files -rw-r-r- 1 root root 2048 Sep 30 03:33 CertFile.rom I'm trying to reverse engineering the router's TP-Link TD-W8961N V3 firmware. ![]()
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