Телефон открывать пробовали? Там обычно написано на плате TX, RX.
Вот такой способ еще есть:
Цитата:
1. find Gnd pin
2. find Charge pins
3. find +Battery pins
4. connect cable Gnd to phone Gnd
5. try to connect cable Rx/Tx wires to all phone contacts one by one (except Gnd, Charge, + Battery) and try to read flash
6. if flash read procedure can start this means that pinout found Ok and you can make other operations
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