This is a known issue and I found out the hard way myself too.
The black PSP-450 camera that comes with Invizimals will not work on firmwares below v6.00. You'll have to upgrade to official firmware to order to use it as of now.
Until there's a new custom firmware over v6.00 or some other way to get the camera working below that such as perhaps working out and getting the right PRXs, it won't work.
The older and silver PSP-300 camera works on all firmwares although I don't know if it'll work with Invizimals as I don't have one.
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