I am interested in purchasing the Uniden Homepatrol-2. In the manual, it says to update the firmware and database, you need to connect it a PC via USB cable. I don't have a PC. Is it a necessity to connect it to PC to update the firmware and database?
It does need to be a PC using Windows. Neither iOS (on an Apple Mac) nor a Chromebook will work.
You don't need the latest and greatest PC. As long as it can connect to the internet, for firmware & database updates (the HP-2 has not had any firmware updates, and none are likely) using Uniden's Sentinel software) you could use an older used laptop or desktop PC. Sentinel does not require a ultra fast PC nor gobs of memory. If you keep looking around, you can find a used laptop for about $100, even less if you find one at a pawn shop, estate sale, or garage sale.
The database that comes pre-installed in the HP-2 likely will be well out of date, so that, at least, would need to be updated.