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somewhere (it was more than year ago)
i got this
power up the phone with +5V applied to test input
phone will respond with "U" at 9600 bps
send "0B" within 1 second (else phone turns on)
phone will respond with "R"
send two bytes 00 03
phone will respond with two bytes 00 02
send 64 bytes 00
phone will respond with three bytes
send another 64 bytes 00
phone will send "S" after about half a second
send the binary file to the phone
here is also a binary uploader with src from that site (i've lost the link :-(
i never use them....
hope this helps