My way to update firmware via Bluetooth (I used HC-05 module wired to AUX-1).
1) In Arduino IDE choose bluetoth serial port you need.
2) Run upload process.
3) Press and release reset button on Ramps. (see NOTE)
4) Wait until finished.
5) Press and release reset button on Ramps to restart new firmware.
NOTE: About 3) - Your need some luck to catch good moment, me usually press and release reset button after "stk500v2_ReceiveMessage():" message in Arduino log window. Everything is going ok when green serial led starts blink continuously.
1) In Arduino IDE choose bluetoth serial port you need.
2) Run upload process.
3) Press and release reset button on Ramps. (see NOTE)
4) Wait until finished.
5) Press and release reset button on Ramps to restart new firmware.
NOTE: About 3) - Your need some luck to catch good moment, me usually press and release reset button after "stk500v2_ReceiveMessage():" message in Arduino log window. Everything is going ok when green serial led starts blink continuously.
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