Joyetech makes many mods, not all are firmware upgradeable. You want a vtc mini, Cuboid or RX200 depending on how many batteries you need, 1, 2 or 3 respectively.
Had an interesting experience mixing my last batch of juice. Loaded 6g with 10ml PG, 1 ml of PEG and 0.6 ml of my "terp mix" into...