Hi,
The board should be pretty new and it should be no problem. We haven’t actually tested this model 660P but it should also fine since it’s tested on other rk3399 platform. Do you have any other NVMe SSD to test?
I don’t have any clue why it’s not working. Do you have multimeter? If you have, you can measure if the NVMe power is on by measuring the following pad 1 or pad 2. What’s the voltage here?
