GSM firmware flash bricked GTA02 GSM modem

W. B. Kranendonk wankelwankel at
Tue Sep 22 17:15:19 CEST 2009

From: Paul Fertser <fercerpav at>
Sent: Tuesday, September 22, 2009 8:37:03 AM

> Omitting the list from CC doesn't usually give more chances to get a good
> reply.
My bad, thanks!


On Mon, Sep 21, 2009 at 10:31:05PM -0700, W. B. Kranendonk wrote:
> --- On Tue, 9/22/09, Paul Fertser <fercerpav at> wrote:
> > Date: Tuesday, September 22, 2009, 12:12 AM "W. B. Kranendonk"
> > <wankelwankel at> writes:
> > > Since then however, I (nor my freerunner) have not
> > been able to access the SIM anymore.
> > 
> > Looks like you're using some obsolete kernel or software that doesn't
> > enable hardware flow control properly (which was fixed with moko11
> > firmware).
> > 
> Since the flash I had some kernels for some distributions; Android,
> SHR-unstable from earlier this month and SHR-testing, which I used to use. 
> Neither of them could get to the SIM.

I suggest you to install the latest SHR unstable kernel and then to try this
command to communicate directly with the modem (ensure you have everything that
can access the modem turned off beforehand):

socat - file:/dev/ttySAC0,crtscts,crnl,echo=0,b115200
echo 1 > /sys/class/i2c-adapter/i2c-0/0-0073/neo1973-pm-gsm.0/power_on

> How un-obsolete does the kernel have to be to incorporate hardware flow
> control, ie, 2.28 is recent enough or does it have to be the 2.29-series?


> Can I check whether HW flow control gets enabled (preferably without
> USB-networking since I can't use that at work; else it'll have to wait till
> tonight).

Yes, you can check all terminal parameters with "stty -a" command.

Be free, use free ( software!
mailto:fercerpav at


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