Modified version, cant install new one. How to flash a STOCK image without pc?

spirates

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Jun 3, 2017
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Theres something wrong with my 4.4.2 galaxy s5-900f, so I need to get the original firmware. I tried to do the normal "reset phone" and my phone got wiped to something that looked like a stock(?) (all images gone etc..) but I still had a few apps that are not stock, and i still got the error message "u have modified version" when I tried to update the phone so it didnt rly work..
Ive searched on yotuube and i find TONS of videos on how to install CUSTOM roms, but how do I install this STOCK rom that I have on my phone now? It's a .tar.md5 file
 

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