Hi Dieter, Erik and others,

On Fri, Mar 19, 2010 at 12:11:43PM +0000, Dieter Spaar wrote:

On Fri, 19 Mar 2010 09:51:48 +0100, "Erik Ekman" yarrick@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.

ok. So my recommendation for anyone wanting to support those phones then is to look at the non-bootloader downloading capabilities. The initial handshake seems to be to respond with "yes" to the ftmtool query. Howver, I have never tried to figure out what kind of commands are supported after nucleus has booted on the phone.

I personally can say that I'm happy with simply ignoring that special firmware variant. There are plenty of 'normal' compal phones out there that we support... let's rather focus on completing the software and porting to phones where its easy (e.g. Openmoko).

Regards, Harald