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I have a 2017 installed tethered Rolec charger - probably the same as yours but because it's tethered the cable can't be disconnected so it doesn't go into that flashing blue light mode.
I thought the blue flashing light signified State A. To go to State B requires the controller to be able to see the car (CP at 9v), which would require the cable connected at both ends. There shouldn’t be a difference between tethered and untethered in that respect.
 

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When switched on, my charger flashes blue. When I plug in my untethered cable to the charger it turns solid blue. When I then connect the car, it turns solid green.
I modified the firmware in my Rolec a while ago so I could control the current so I don’t remember exactly the sequence.

I thought It was
Flashing blue - State A - CP=12v - disconnected
Solid blue - State B - CP=9v - connected
Solid green - State C - CP=6v - charging
Solid red - State D or fault.

I was sure there was a difference between connected and charging.
 
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