Addendum: the ethernet LEDs start blinking pretty much instantly after power is connected with a working card, but with this card it seems the device has already decided it's not going to boot since the LEDs just turn on and don't do anything else.

You really need an UART to USB adapter to get logs at boot. To give an example, the model next is working fine (1€) at https://fr.aliexpress.com/item/Free-shipping-PL2303-cable-PL2303HX-USB-to-TTL-Cable-module-4p-4-pin-RS232-Converter-serial/32285844988.html?spm=a2g0s.9042311.0.0.e685tj I've caught...

In some of the older NanoPi one had to place a bootwait arg in the boot environment variables. I'd have to try and find the details. Do your boot messages provide any clues why it is not proceeding? These units were bought in December. I don't have access to any sort of feedback, as of yet - just s...

I have 2 512mb NanoPi Neos that won't boot from one particular SD card. The card in question is a very very old PQI Class 6 8gb. The card tests fine using F3 with 0 errors, and works just fine in everything else, including multiple laptops in both Linux and Windows, an Android phone and in a Raspber...