Well, I decided to breathe new life in my level 30 cold hydro made on easy mode before zones 6+7 came out...
I used a .sol editor to edit the difficulty number from 0 to 1, hopefully bringing it to challenging.
I tried both opening slot1 (the original) and then saving it as slot2.sol (slot 2, the copy), however this resulted in an empty slot.
Using windows explorer to copy and paste slot1 and renaming it to slot2.sol didn't work either.
Soooo...how can I make a copy of the character, change ONLY the difficulty to challenging, and put it into slot2 so I can play zone 6?