How to switch to legacy via docker

Hi. Could you please describe to me how to switch to legacy via docker. I have read the topics concerning this and have spent a long time trying various methods. I have’nt got much programming knowledge. I just require my Arduino uno to communicate with my pi. I followed the step by step instructions but do not understand what i have to put instead of "+refs/heads/:refs/remotes/origin/”.
I only get master branch option when i try to use the updater in docker.

please help i just want to get brewing again!!!

Did you try these steps?

Don’t worry I have used an older version of raspbian and installed brewpi the old fashioned way and it works perfectly. I love brew pi and have got my hacked fridge back up and running. Beer will be on its way soon! Many thanks for your time :blush:

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