factory

I've been trying to figure out how to default my Minelab Manticore, and I've tried to get this information online, but I'm getting everything but. I want to factory reset it, since I'm hoping it may resolve the relentless squealing/squawking noises on all but one of the beach settings (I've...

Got a "never"use Teknetics Delta 4000 on ebay.,..turns out its 13 years old....Its in great shape but the + button doesnt work ., Teknetics said they will replace the circuit boards for $50. The tech @ Teknetics couldnt tell me if would be original equiptment or new technology., does anybody...