Updating phone to 6.1

I have been using build 971 and testing on my iPhone version 6.0.1. Every time I connect my phone it asks me if I want to upgrade to version 6.1. I say ‘no’ in fear that it will not be compatible with build 971. If I say “yes” and upgrade to 6.1 will I still be able to build using 971? [import]uid: 75779 topic_id: 36087 reply_id: 336087[/import]