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Thanks for the reminder!
For the next version I'll probably change USB to tag-connect and make a ZIF jig for programming the initial bootloaders (which is Espruino for the STM as you know).
I'm having a weird issue with the diode being a smoke-emitting diode. So strange... :( The power section is the same as previous revision, and the same as the power from Espruino. It's D1 from the Espruino schematic that smokes, oh well. Onwards with troubleshooting!
Looks great! When you do the next one I'd really strongly recommend you use a through-hole (4 pin) Micro USB connector though. The ones like you have there can come off the board quite easily.