I come from Vietnam, I have participated in this forum for a long time. The devs helped guys like me so much to be able to use our phone in the best ways.
Today I have one thing to share with you, may be it will help the devs to find a way to solve the problem of reseting warranty bit in Samsung Galaxy Note 3 into 0.
I bought my Note 3 N900 five months ago. At that time, I rooted my phone and then update my note 3 via OTA. But from the fist update which showed Warranty Bit: 1 (MJ7). I didn't update it via OTA any more.
Then I download a stock rom named "STOCK-DEODEX-ROOT-N900XXUCMJ7_N900OLBCMJ3_N900DXUCMJ3_HOME" of developer @nguyenxuanhoa then rooted it again and used it untill yesterday.
Yesterday, I found that my device wasn't rooted and CWM disappear. I couldn't understand. Then I installed CWM and rooted it again. After that. I uploaded rom cook version 9.0 then 8.1 (android 4.4.2) of developer @nguyenxuanhoa but it did't work well (couldn't use apps restored from titanium backup and couldn't logged in evernote)
Then I used the stock Mj7 4 files but just uploaded 1 file AP in order to restore my phone to android 4.3 but it was suspended at samsung logo. Then I went to stock recovey to wipe data and reboot, but it was fault: force close samsung keyboard.
In the last time, I flashed 4 files in stock MJ7 to restore again and OMG! The warranty bit was restored to 0. I can't understand but very happy. I can use Knox, of course. Everything in my phone was restored as when i bought it from the seller.
I hope that information will help you to guess how could we resset warranty bit of Galaxy Note 3 N900 into 0.
Stock Rom Mj7 4 files: Link/
STOCK-DEODEX-ROOT-N900XXUCMJ7_N900OLBCMJ3_N900DXUCMJ3_HOME: Part 1 Part 2
Rom cook by @nguyenxuanhoa: Link