Amundsen+ connectivity issues and firmware update

Hi, I have an Amundsen unit Part No 3T0035292F which has Software version 0263.

My issue is that every two or three days it randomly forgets my connected phone and it has to be re- paired. Everything works fine apart from that. I'd like to install a later versión of the firmware if possible in the hope that solves the problem.

Has anyone any idea where I can locate this please. I've found a site Electroda where they have a 32 mb update which claims to upgrade the 2012 model, which is the one I have, but I'm wary about inadvertently bricking the system as I can't be certain it's legit.

Can anyone help/advise please?

Thanks.