New firmware image type

[mrm3ss]

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]

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.