My diamond engraver attachment kit just showed up in the mail, and much excitement ensued... until I couldn't get it to work. Soldering everything up was fairly straightforward, but I can't for the life of me get it to spin up. No LED lighting up either, so I thought it must not be getting a signal from B3 on the EBB. I checked and saw that my firmware was a couple revisions out of date (2.0.1) and figured it couldn't hurt to update it, so downloaded the latest from the website. But now it won't go into bootloader mode! I've done the thing with the prg and rst buttons a million times, but the USR light only flashes once, and then goes back to only blinking the USB light.
I'm really hoping there's an easy fix for this, there must be something I'm overlooking, it's just not been a winning day for me.