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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.
@MichaelS
Thanks alot Gordon. I indeed have the blue ESP01 board. I tried again the IDE method of flashing that board, grounded GPIO0 and momentarily grounded the reset pin, and I got the same result in post #15 above (i.e. interrupted write). So I reviewed that article, and found I could successfully flash the v2.0.0 firmware via the previously-described process using the espflasher application, with the 4 files each placed at respective addresses as pointed out in that sevart article (Installing the Non-Boot Firmware section) you pointed out. Thanks alot for locating that article.
I'm wondering in the IDE update whether you're applying the v2.0.0 update as per the info in that section (for that ESP01 board).