No Operating system on phone?

Long story short, I installed Xposed and my device went into a boot loop or just stuck at the T Mobile splash screen.

I factory reset and format data to try and fix the problem.

Now I don't have an operating system on my phone.

Where can I get the system for my phone? I have a SM-910T

I was on COD6 and was reading about COG2 being abailable now?

What are the differences?

Thanks for input

Yes it's that thread again...No operating system

Iv seen plenty of threads about this but can seem to find a straight answer for my issue specifically.

Like an idiot I wiped the system and internal storage, hence having no OP.
It's also saying my phone is no longer rooted and tries to install superSU but obviously fails.

I currently have no access to a laptop, just my android tablet. Am I able to download firmware and flash it while in twrp in order to boot back into the standard Sony Z2 android software. My model number is D6503

Replacing everything on phone, including bootloader and operating system

Howdy,

This might be a foolish questions, but I was curious if I would be able to purge everything on my At&t S5, including the bootloader, and replacing it with something else. Such as a something that is not ruled by AT&T, like a stock bootloader from google or a distribution of linux. The device is currently soft bricked, turns on, and I am able to odin to it, but I am not willing to fix it only to put the at&t garbage back on it. I will not be utilizing the phone capabilities I just would like to use it as a mini computer? Has anyone done this or have any other recommendations as to what I should do with it?