Upgrading Galaxy S5 G900A (AT&T variant) to Lollipop. - Galaxy S 5 Q&A, Help & Troubleshooting

Hi guys,
I have a Samsung Galaxy S5 AT&T variant running Android 4.4.2. I am not in the US, and I do not have an AT&T sim so I cannot upgrade it to Android 5 Lollipop over the air.
I have searched all over the internet and also on this forum, and I'm very confused because I've read some conflicting reports on the upgrade path for this device.
Some articles mention I need to upgrade to android 4.4.4 before I can upgrade to android 5. Others do not.
My bootloader is not rooted, nor do I want to root it. I mention this because I have read in multiple places the rooting the G900A is a huge pain in the ass, and also that once you upgrade, Lollipop's bootloader cannot be rooted.
I have attached a screenshot of the baseband, kernel and build information. I would be eternally grateful if you could help me with this upgrade.
Mir.

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[Q] [Rom][G900AZ][Cricket Wireless]Touchwiz

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I was wondering if, since the official Lollipop rom is available for AT&T since last week for the G900A.
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Hello,
I recently bought an S5 Active off of Ebay and I'm using the bring your own phone plan on cricket wireless. Currently my phone is on 4.4.2 kit kat, and I know that lollipop has been released for a while, but my phone tells me that it is up to date. Is there any way I can update? I'm completely new to the world of ROMS and all this other stuff, so any help would be appreciated!
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"definitely do not upgrade your phone over the air if you have 4.4.2 and it is a galaxy s5.
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