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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.
@hungryforcodes
There's a parameter in the Espressif IDF that can set the crystal frequency, and apparently has an "autodetect"setting. Its mentioned that Arduino also "autodetects" the crystal frequency. I have no idea how thats done.
https://github.com/espressif/esp-idf/issues/1351
The above thread actually deals exactly with this Heltec board. Unfortunately my Espruino SDK is built using a downloaded "prebuilt" IDF for OS X. In theory I could recompile it, with the right flag ("esp32-xtal-freq-sel") from scratch, but I'd have to look at what that would involve, so I cannot test this at the moment.