Yes, you can go back to OG1 using Samsung Kies 3.
---------- Post added at 04:03 PM ---------- Previous post was at 03:52 PM ----------
I was able to install Clockworkmod recovery on Galaxy S5 SM-G900P running lollipop OG1 firmware using this method and then flash a custom 4.4.4 and 4.4.2 roms with recovery mode and flash NE5(for 4.4.2) and NK4(4.4.4) kernels with odin and also flash NE5 modem in order to install SSU.apk (Samsung Sprint Unlock) which unlocked the phone but i did not get a signal with T-Mobile sim card and with more research i found out that this unlock is not made for in USA but for international use.
Did you use the method i providing in the link? This one: http://forum.xda-developers.com/show....php?t=2697523
I forget much smarter people than me have tried this much longer worked for another phone I had, thought combining the methods may help
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