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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
I wonder whether the USB bootloader is corrupt. The firmware should have been verified, but I wonder whether Seeed decided to leave off that step because it took too long :(
Can you try running the following code:
var crc = 0; for (var i=0x08000000;i<0x08002800;i+=4) crc = (crc<<1)^(crc>>63)^peek32(i); console.log(crc);And let me know what the result is? I get
2628236757068185765here.