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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.
@Gordon
Are you using firmware 1v98? and on Puck.js?
Which IDE are you using? The Windows Native one? The IDE should be splitting those writes into a series of function calls, but it doesn't appear to be (I guess it might be an old one, or maybe I didn't update the Windows Native IDE).
It looks like the flash write fails because of the write size being greater than 4k though - I'll fix that in the firmware (but with the right IDE it shouldn't be an issue anyway).