Hey, thanks for this guide. I intend to follow it in the near future to downgrade a friend to update them to 3.02 OE-B. I'll let you know my results. :)
One question. I've downgraded mine back to 1.5 so I can do what needs to be done on the 1.5 for this. The 1.50 Helper zip you have uploaded doesn't appear to contain any DownHelper program, just the 1.5 eboot and (I think) IPL Dumper.
So with this in mind, I looked around. Is this the right program? It says it's for 2.71, so I'm not certain. Is there a specific 2.80 DownHelper, or can I go ahead and use this one?