fob issues

Hi, I have had the key battery low message come up on the dash for my main key (normal VW group flip key). Instead of replacing it I just used my spare key. Then my spare key battery became low and the same message came on the dash. I bought replacement CR2025 batteries for both keys. I firstly...

So my fob stopped working after changing the battery recently. The battery was only low but when I put the new battery in and it didn't work at all. I decided to put the old battery back in and to my surprise it still didn't work! Thinking there was a particular technique to changing it, I gave...