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Hi Mark,
Was the seal on the package broken? Then the packaging has been opened.
A red LED means that the supply voltage is too low.
If you start the bike and no LED lights up, this is not correct.
The fact that the blue LED flashes after the bike is turned off is also a sign that something is wrong. What did you connect the yellow wire to, on a contact switched power supply?
If the LED flashes red and blue, the supply voltage is around the tipping point of 12.5V.
Did you connect the red and black wire directly to your battery?Can you measure the battery voltage with a multimeter? What is the voltage when the bike is off and what is it when the bike is running?
Can you also connect a power bank to the USB connection on the DVR? Then disconnect the DC converter. Will the K3 turn on? The power bank must be able to supply at least 2A.
During normal use (good battery voltage), the blue LED always lights up continuously, both when the bike is switched off and when the bike is running. If the battery voltage becomes too low when the bike is switched off, the red LED lights up (parking mode is then switched off).