phone will not root again.

[dawn victoria]

I have a Galaxy Grand Prime SM G-530AZ. It is running on version 5.1.1 and kernel version 3.10.49-846271. I previously rooted using kingroot then used supersu me to swap to supersu. I recently unrooted my device to do a system update which is now version5.1.1 but I can't seem to root my phone again. I have tried almost every thing including the pc. Any ideas? Thank you!