New firmware image type

Psychotropos / sercomm_fwutils

Tools to manipulate the firmware images of certain Sercomm-made consumer networking devices

MIT License

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New firmware image type #4

Open mrm3ss opened 6 years ago

mrm3ss commented 6 years ago

Found a new image type in the Speedport Plus firmware, it is identical to type 1 except that have some kind of hash at the end of file, the last 16bytes, also the key and IV seems to be calculated differently.

Any clue how to implement this type?

Here is the link to firmware in the question:

http://help.cosmote.gr/system/templates/selfservice/gnosis/files3/speedport_plus_323520.img

Psychotropos commented 6 years ago

Short of having a dump of the JFFS2 filesystem of the device itself, there's no sure-fire way of replicating the new container type.

If you have a version of the firmware from right before the format was changed (that is, assuming the device wasn't released with the new firmware format in place already), there might be a way to reverse the new firmware container going off that.