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Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
@Robin
Was attempting to determine which version was flashed.
Not super critical to know just yet, but as the board was just flashed, do you recall which version?
or, when the board does boot
process.envAttempting to determine if we have a separate flash issue or coding issue in addition to the soldering/use of additional port.
Which pins were soldered? An uploaded image would really assist here.
Is the intent to solder to USART1 or USART2?
By chance are Tx and Rx reversed?
Is there a TTL converter such as CP2102?
Regarding OS, I'm not able to push forward further, as my experience is on Windows10 only. Others may be able to, using the detail you have previously provided.