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Old 03-10-2009, 13:52   #2 (permalink)
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few things which i know i can tell.

to unlock or communicate to phone

you need to know platform. that's the first thing.

you need to know how to deal with phone to repair something . that's the protocol of communication.

you need to know phone will work with calculated code or stored code at some where at phone. that's the algo third step.

you need to know that if phones commands which its accept crc / check sum which need to send with commands without it no reply you can get.

to unlock some phones its really easy in developing like reading code in stored area. and typing code at phone.

to unlock high security base phones like sagem which use calculation method. to unlock this type of secure platform need to calculate correct code which is not not easy at all.

to unlock some phone which have firmware read protected need to learn about there bootloader and unlocking at boot mode/flash mode.

but there are many things its depend.
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