Incomplete trace (due to high-speed SIM?)

Holger Hans Peter Freyther holger at freyther.de
Wed May 22 10:23:01 UTC 2013


On Tue, May 21, 2013 at 03:53:45PM +0200, Arthur Léna wrote:
> I tried booting the iPhone using 2 different SIMs (this one from
> Free Mobile and another one) and the trace seems very short using
> the Free Mobile in comparison to the other one. By parsing the ATRs
> of both SIMs, I found out that the communication is done at 312500
> bits/s with the Free Mobile SIM and only 78125 bits/s (for a clock
> running at 5MHz). Could this explain the loss of entire ADPUs by the
> tracer? If yes, is there a way to remedy to this problem (firmware
> update for example).

Some people reported success by reducing the size of buffered bytes
in the firmware.

holger




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