He's used J-Runner, so I reckon he's done this:
dumped the NAND twice.
created ECC
flashed ECC.
Ran into problems and then decided to dump the NAND again, overwriting the existing ones.
I'm sorry to say that J-Runner is not idiot-proof. you're supposed to have some sort of clue what you're doing before you start. The second you couldn't get it to boot you should have STOPPED and asked for help then. Now it may be too late.
Find someone local and send them the console. Hopefully it's just your soldering which is the problem (which, again, we cannot say for sure as 3 pages in and no images posted).