Toad Ai606 issues

[Neal-0cetn]

Not started the VW Golf for past few weeks and today after reconnecting the battery, the siren started making constant clicking noise and led light stays orange. I’m unable to start even after trying various button options on the key fob. The fuel pump is priming, so think this is an imobilser issue.
I’ve replaced the car battery but still same issue. Is there a internal battery on Toad AI606 alarms?

Any ideas in how to fix or know of a car security forum?

Thanks