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@Werner sudo screen -LU /dev/ttyUSB0 1500000 is the command used using a diff USB-UART(CH341) and debug pins, im getting output to terminal, the only thing is im noticing not all is printing, and its changing every time i re-run the command. the logfile screenlog.0 shows different output to whats on the screen, unsure if this is due to character encoding, or missing data. Example somtimes it may show missing text such as Boo nux on physi... CPU instead of Booting Linux on physical CPU

@Werner Connected to UART and running sudo dmesg returns [ 5936.103740] usb 1-1: new full-speed USB device number 12 using xhci_hcd [ 5936.283946] usb 1-1: New USB device found, idVendor=10c4, idProduct=ea60, bcdDevice= 1.00 [ 5936.283951] usb 1-1: New USB device strings: Mfr=1, Product=2, SerialNumber=3 [ 5936.283954] usb 1-1: Product: CP2102 USB to UART Bridge Controller [ 5936.283956] usb 1-1: Manufacturer: Silicon Labs [ 5936.283958] usb 1-1: SerialNumber: 0001 [ 5936.293074] cp210x 1-1:1.0: cp210x converter detected [ 5936.296064] usb 1-1: cp210x converter now attached to ttyUSB0 connecting usb to uart cables to pin 6 for GND, 8 for TX, 10 for RX - https://wiki.friendlyelec.com/wiki/index.php/NanoPi_NEO3 now running sudo screen /dev/ttyUSB0 115200 Also tried with baud rate 1500000 no output in screen, just a flashing cursor also tried powering down the SBC, reconnecting, etc. the img im using is https://www.armbian.com/nanopineo3/ - Armbian Bookworm - Armbian_community_24.2.0-trunk.449_Nanopineo3_bookworm_current_6.6.13 What do you recommend? These friendlyElec boards are a great stress, I never had this much problems with other boards such as raspberry Pi. 3 days wasted trying to connect... not a single bit of progress made, numerous distros copied to sd card, nothing works.

@Werner thanks for reply, just purchased a serial adapter from amazon. one question - applying to both ethernet and serial connection - is it relevant if the microsd card(and os) is plugged into the board or not? ie will it show up either way?

would you say this is definitely a boot or connectivity issue? rather than a usb-ethernet adapter issue? spent so much time trying to get this adapter to work

I have spent 7 hours now trying to connect to my Neo3 via my laptop using a USB to Ethernet Adapter. Ive also tried changing the nanopi microsd card image to see if it has any effect. from Ubuntu / Armbian / DietPi. When im powering on my Neo3, with ubuntu only the red led shows, with the other two, the Red LED shows plus the green LED flashes. Is this actually possible? Can I plug my Neo into my laptop with a ethernet usb adapter? or does it have to be into a router? The error im getting on my laptop is Connection Failed : Activation of network connection failed. the network manager shows it forever stuck on Connecting - 1000Mbps Running cmd nmcli device status returns ethernet disconnected I ran dmesg to see if there was any errors, one line read firmware: failed to load rtl_nic/rtl8153b-2.fw this error is for my usb to ethernet adapter, I fixed this by downloading rtl8153b-2.fw into /lib/firmware/rtl_nic/ and running sudo update-initramfs -u After running dmesg again, another error causing problems could be xhci_hcd 0000:00:14.0: WARN Set TR Deq Ptr cmd failed due to incorrect slot or ep state. im unable to fix this so far, I have tried changing ethernet cables, and also adding kernel parameter intel_iommu=off The error still shows in dmesg and im unable to connect to my Neo3 Any advice guys?

Hello Mark, Did you make any progress with this?