I very new at Arduino, but have some experience with the Raspberry. Im using a Arduino Uno R3.
I am trying to put new firmware on a Sonoff (https://www.itead.cc/sonoff-wifi-wireless-switch.html) and I have seen all the Youtube-stuff on how to do this.
However, I cant seem to get past a Sync-error, when uploading the firmware to the Sonoff.
I have tried switching Rx and Tx - no luck I have made sure that the powersuply for the Sonof gives off 3.3V The Sonoff is flash-mode.
Somewhere it was suggested that I had to remove the chip from the Arduino - tried that - still getting the Sync-error.
The program Im uploading is the blink program as demonstrated in the video here. Links are in the comments: https://www.youtube.com/watch?v=_389pQPLyr8
In the video, he uses a FTDI module, but as the Uno R3 dont have a USBport and it is stated in several forums, that you can use the Arduino directly for flashing, I wanted to give it a try.
If anyone can help me get this Sonoff flashed by pointing me in the right direction, that would be great.