Nee 
... of being a an early adopter who hasn't been around enough with all of us adicts 
We've seen all these issues too but did hang around when they got solved too.
Back then there were nowhere near as many posts to plough through to find a solution again.
Just like @bko said - there is an easy way to do it without JTAG but we seem to have lost it 
Edit: I think I found it
As far as I remember I did it as described here
Otherwise this might also be interesting
Flashing ? firmware to 0x00020000 or 0x08005000 or?
BTW: I hope you ordered Photons - those protons are just overcharged and rather slow