Question [Q] is there any way to install wifi fix for DN3 ROM with new Download Mode?

I've been using DN3 V.3.2.1 on my N7100 (Galaxy Note 2) for some time, and noticed that the wifi (along with portable hotspot) didn't work. There's this wifi fix to install via odin to fix the problem.
The thing is, before DN3, I've flashed stock 4.3 N7100XXUENA1, without knowing that it comes with new bootloader. The new download mode restrict any rom installation except the stock 4.3 (though recovery and root installations is possible, dunno why) with an error : UNSUPPORTED VERSION

EDIT : The wifi works, but if I toggle portable hotspot, the hotspot can't be turned on and then when I try toggling wifi, it can't be turned on too. The only workaround is to reboot the phone to make the wifi work.

Is there any way to fix this? Since my main internet source is from my phone so portable hotspot is a must. Thank you and sorry if this has been asked before.