Here you find the howto
Serial is only checked during power up.
Yeah, this made me wonder..
Firstly, I am doing this all without a battery in.
So then I plug it all in to the USB-TTL (as described above), and then plug the USB-TTL in to the computer.
When that didn't work, I tried pulling the connection for 3V and plugging it back in.
That didn't work.
I tried similar with GND, and that didn't work either.
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