How can I upgrade my Galaxy S5 to Marshmellow. GM-900A

[AC Question]

I purchased from AT&T and got the unlock code om them. I use Consumer Cellular as my carrier. I don't want the AT&T apps hoggng up my storage.

 

[Rukbat]

Since it's not with AT&T, they won't issue the update. Since it's not a CC phone, they won't issue the update. Check on the AT&T S5 forums on XDA Forums for a ROM (flashing a Samsung ROM is simple - see [Samsung] How to flash Stock ROM via ODIN). Most custom ROMs have all the carrier bloat removed.