How do I get OTA from I got last update np. Had no idea my s5active even had custom rom yesterday update failed "kernel" in red locked me out. Ok  so I got a cool salesman who initially said my phone was bricked &amp; tried 2 sell me a new phone. I explained I'm as broke as possible &amp; was really upset about my phone not working!! Also I went from super happy (bcuz I thought I was getting marshmallow) to terrified bcuz my phone locked me out! He then got it working again but said DO NOT ACCEPT THE UPDATE. Or it will keep happening! This has me extremely upset being that I did not know or want custom rom on my phone. ESPECIALLY IF IT WAS GONNA BLOCK MARSHMALLOW! Plus what good is it if I never even knew it was there until yesterday! I've had the phone 4 a year at least!! If ANY1 can help me be able 2  get my update plz help! Ive been manually checking EVERY DAY, and constantly doing "android check ins" 2 try 2 speed up the process. I really just want my update! 
Thank you
-Joe
The thing is AT&amp;T's S5 Active doesn't have Marshmallow available yet, at least as far as my investigation goes. The best thing you can do is back things up, use Odin to reflash phone (to clean up custom ROMs and such) and try to check for updates again. You should at least be able to accept the update, but 1) it might just be a security patch and 2) since I don't own the phone, what will happen next is beyond my knowledge.