Reactivation lock issue help plz

[tulipkhan88]

I'm having issue with my note 4 N910C ,I need to root my phone for root or flashing twrp recovery reactivation lock must be untick when I try to untick it doesn't get turn off I also flash the stock rom after flashing a rom, I can't turn off the reactivation lock of my phone. I uncheck it, but when I enter download or recovery mode, it is still turned on and this doesn't link to any samsung id account but show activation lock on in download mode even I flash stock rom and done hard format but still got this issue
help would be appreciated

Thanks an advance