Hikvision - Clearing Passwords and/or Loading Firmware via TTL Serial

I recently picked up a used Hikvision DS-7608NI-E2/8P (at auction) that was password locked. The seller was unable to tell me where it was sold, and all the Hikvision offices I contacted (US, EU, AU, CN, HK) provided the canned "purchased through an unauthorized" channel response. The stated source of the hardware seemed to have no bearing on the response either (I bought local, I bought at auction, acquired through acquisition of another company, etc). I have another identical unit (also...

Hikvision - Clearing Passwords and/or Loading Firmware via TTL Serial