... cable usb serial cable gsm T189, T190, T191 data upgrade,upload,backup FT232RL/CP2102/PL2303HX ... configuration: USB serial(TTL 3.3v) to 2.5mm gsm data cableUSB gsm upload, backup, upgrade cableCP2102, FT232, PL2303 optionalPinout: VCC, GND ... , T190, T191 usb ttl to 2.5mm AJ male cable, , gsm data cable for T189, T190, T191