Yes, I had to do it this way when the 62mb partition wouldn't open using rkusb.tag, so it must have got messed up somehow.
afaik the "boot code" doesn't matter much, my player isn't matched to the "boot code"
There is one "boot code" with the RKDM tool and another different one with the upgrade tool and it doesn't seem to matter which you use.
I take it you copied the 4 folders into the 60 meg hidden partition and then rebooted:-
APPDATA
RESOURCE
SYSTEM
SYSTEM00
Your firmware copy may be damaged, have you tried all the other firmwares in the downloads that look like your player.?