Sorry to resurrect and old thread, but I think this is the right place to post...
I tried updating the firmware to micronucleus-1.06-jumper-v2-upgrade.hex and it appeared to work, but I wasn't able to program it using arduino IDE, even if I connected P5 to GND as I plugged it in.
I then updated to micronucleus-1.06-upgrade.hex, and was able to program it using the arduino IDE.
I then tried switching back and forth a few times, and now it doesn't work at all. I can't even change the firmware any more. As soon as I plug it in, Windows says that it doesn't recognise it, regardless of whether I have P5 connected to GND as I plug it in (which looks like it's skipping the bootloader - right?)
Does it sound like I've buggered the firmware upload somehow, or does it sound like a hardware failure? Am I shorting the right pins? Do I need to try to use an arduino to update it using ISP mode?
Thanks in advance for any help