What does the screen indicate once the Solo and controller are powered up? If it is the "Preflight Update Required" screen, there are solutions...
If you are a Facebook user, join "JB's Solo Users Group" - all the latest info can be found there. If you have SOLEX, the process is not overly painful and you'll end up with a fully updated and flying SOLO. By all means, check it out. It is a "private" group, answer the few Solo related questions and you'll be in.
There are multiple methods available for reactivating your Solo.
Start reading here:
Install Open Solo
In most cases, everything can be done using Solex...