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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.
Abhigkar
@fanoush
I think the protection is only enabled for official board names
https://github.com/espruino/Espruino/blob/master/targets/nrf5x/jshardware.c#L2135
If it is reproducible then maybe logging in jshFlashErasePage for zero address could be interesting to see if it gets triggered. Or the procection there could be enabled to see if it goes away.
Anyway uploading similar code for two different devices to third device without reset() in-between is definitely asking for trouble and is great stress test. Anything could happen during upload
However erasing MBR is still interesting result of such abuse, the js code uploaded does not write/erase internal flash anywhere. If the code was really uploaded to ram only and not storage then even storage bug in not likely.