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update OTA JB for i9023xxki1 ?

hi all
how do i update to 4.1.1 from 4.0.4 on my stock i9023xxki1, locked, unrooted ?
i'm trying to do this for my sister, I don't to install CWM or root the phone.
Is this possible ?

[Q] Updating official rom from 4.0.4 to 4.1.1 AND root

My tab is originally in 4.0.4 with root.
Then, I flashed the official firmware of 4.1.1 via ODIN to my tab.
I think the official 4.1.1 is not that smooth.
It is safe for me to upgrade with existing root?? Do I need to flash again??
Also, how to root the 4.1.1??
Thanks in advance!

[Q] Downgrading Droid Mini?

Can I downgrade my 4.4 Droid Mini to 4.2.2 using Odin and loading the stock firmware in the PDA box? If not then how should i downgrade?
Also it seems there are 2 versions of 4.2.2 does it matter which I chose? Just want to be careful and not brick my phone
My goal is to downgrade so i can root my Droid mini with something like MotoRoot

[Q] Downgrade

Hello, I have a htc one X which I rooted in the oast. It has a hboot v1.72 and its s-off. I am using a custom 4.2.2 rom. But now I want to downgrade my phone to earlier JB rom or stock rom. How do I do it?

[Q] Reverting back to stock 4.4

I recently upgraded my G PRO 2 (D838) to 4.5 via an OTA update. I'm having a few issues with Jellybean, in particular charging speeds and am wanting to downgrade back to KitKat.
I have seen links to stock 4.4 firmware, but I just wanted to clarify that the phone will have to be rooted first before I try and downgrade?