Well I've had another go but no luck. I must have tried about 50 times, sometimes holding it on for over a minute without the slightest flicker from the power led. I'm pretty sure I've physically stuffed the flash chip with my bumbling.
This is going in the bin now before I lose any more hair over it... unless anyone knows a good use for the parts? Think I'll strip the USB connectors, they might come in handy.
Thanks anyway everyone.
