C139: get ftmtoolerror from ramloader

Dieter Spaar spaar at mirider.augusta.de
Fri Mar 19 12:11:43 UTC 2010


Hello Erik,

On Fri, 19 Mar 2010 09:51:48 +0100, "Erik Ekman" <yarrick at kryo.se> wrote:
> 
> Yes. Mine has special US Tracfone firmware which seems to have a
> particularly evil unlock scheme. Cutting one of the balls in the BGA
> seems the way to do it..

I had a quick look at the bootloader from a dumped Tracfone C139
firmware. Its nearly the same the Osmocom loader supports, however
this special bootloader checks a flag in flash memory to decide wether
to allow RAM download or not. If it is disabled, only the FTMTOOL
check is done and no RAM download at the boot stage is possible.

Best regards,
  Dieter
-- 
Dieter Spaar, Germany                           spaar at mirider.augusta.de




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