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how do I switch off my cobra 7777 alarm?

I needed to replace the batteries recently, but when I tried to switch off the alarm and unlock the car after replacement, it didn't work. I tried disconnecting the car battery for an hour, but still no success after I reconnected. Any ideas please?

Chris
August 2011
Vehicles, CarsCar Alarm Batteries

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Cobra 7777 Alarm Reset - Help & Solutions