we350z

Looks like previous vendor may have flashed the wrong firmware (AV3155) on a AV5155DN that is part of my condo HOA's security system. Is this camera locked? Does it have JTAG or serial connectors? Is it easy to flash via these methods? It powers on but I can't discover it in AV100 or ping it. The orange light on the NIC just flashes seemingly randomly... It's out of warranty so they want $250 + 3% processing fee to fix it. I have to pay to ship it to them obviously too so wondering if there is a decent, less expensive option to replace it with? --Thanks