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Holger Hans Peter Freyther holger at freyther.deOn Thu, Nov 08, 2012 at 08:34:46AM -0800, Samuel Weinbeck wrote: > Hello, > > I am interested in modifying the firmware of the simtrace device to > perform modifications on the data sent back to the phone. Is there any > documentation on how this can be done? I could not find any on the > website. I looked at the source a little bit but I am hoping someone > here can give me a jump-start on the best way to do this. Hi, general information about building and flashing can be found in Chapter 6 of the manual[1]. For manipulation you should operate the bus switch in a way that SIM and SAM, and Phone and SAM are not directly connected. This bus switch configuration is mentioned here[2] It would be nice if you have the time to implement the MITM mode. Please feel free to continue asking technical questions. holger [1] http://bb.osmocom.org/trac/raw-attachment/wiki/SIMtrace/usermanual.pdf [2] http://bb.osmocom.org/trac/wiki/SIMtrace/Hardware#Modi