Use the latest xda tether app 3.2 beta 1. just came out a few days ago.
4g tether works unsecured. Secured breaks 4g tether. So don't setup secured. :) or reflash rom
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From my experience you can flash from cwm5 but I've noticed los is better when flashing from sb cwm6 from Mobil Odin on a GB based rom.
DK N3 - SB 8/20 Kernel - LowRider gapps - FH13 (Daily)
It only boots up with low rider gapps and gets a little wacky (blackscreen) after setting up gmail to phone.
On my daily n3 for now (love this setup lol) no los at all :D
DK N3 - SB 8/20 Kernel - LowRider gapps - FH13
DK this should be a FAQ
Just pull the boot.IMG from that file and save it to your SD card. Then open Mobil Odin and flash the boot.IMG
DK N3/Lowrider Gapps/FH13