Just unboxed a 920i 128GB. 5.1.1 wants tp install. Should I? Need to have root

Again this is an SM-G920i.

Some things that I wold like to do with this phone, and it looks like I can with th 5.02.

Root
TWRP
Custon ROMS

Should I just ignore this update 5.1.1 update and work with the 5.02? I know that I can root using ping pong on the 5.02 as well as flash ROMS using FlashFire. I did this with no issues with my AT&T 920a.

Unlock lte bands on 920i or any exynos ...

Anyone manage to add or remove bands on the Note 5 ?