I bought a Crystalio II not too long back and it came with firmware v2.10pd, which is the projector designs firmware. I wanted to flash it to the original v2.10 firmware. I downloaded it and followed the firmware instructions but it wouldnt work. So I then asked Substance for some advice as he used to own a CII. He suggested that the USB I was using was too large and the CII wasnt recognising it. I was in fact using a 32gb SD card in a USB adapter. So, I scoured ebay for weeks until I found an old Kingston 1GB USB that was still sealed and dated on the back with a vintage of 2007. Using this USB worked! I have successfully upgrdaded to v2.10 firmware. An issue I was having before was that I couldnt find a way to adjust the screen size. It was shifted too far to the left and no matter what I did I could not adjust for it on the Crystalio. So what I did was force overscan on the TV, which worked but was not ideal as the TV is not in full pixel mode. Luckily that has been resolved now.

So I'm putting this out there for anyone else who has the same issue.

Instructions can be found here. You can download the firmware here.

Thanks to Substance.