If you ever buy a used Blink camera, assume it is locked. Perform the battery-removal sync-button reset (Part 4A) immediately. And if all else fails, Amazon's support team can remotely unlock devices for the original owner with proof of purchase.
Blink cameras are to prevent theft. You cannot “hack” or bypass this. Only the original owner can remove it from their account: unlock blink camera
: A friend or former homeowner gave you the camera but forgot to delete it from their app. Step 1: The Only "True" Way to Unlock If you ever buy a used Blink camera, assume it is locked
This guide will walk you through every method to unlock, reset, and reclaim control of your Blink Indoor, Outdoor, XT, XT2, or Mini camera. Blink cameras are to prevent theft
To access the batteries or the QR code, you need to remove the back panel. Use the Tool
