Nano 2GB broken beyond repair?

Hi, I’m trying to figure out what might be broken in troubleshooting my Jetson Nano 2gb, with unfortunately limited resources.

Here’s what happened, and where it’s at. Apologies as there are many similar issues, but perhaps what differentiates this one, is I never even see the boot screen / headless connection. Wondering if it has to do with re-flashing Jetpack.

I recently flashed a 128gb micro sd card with the latest compatible Jetpack which worked for Jetson, and got a good way through setting it up yesterday before I ran into an issue with connecting my Wifi. I was trying to do this headless since I didn’t have a keyboard handy, and kept getting my wifi password wrong for some reason and it seemed like I couldn’t progress. While in the middle of this stage however I figured out a way I could instead do the configuration NOT headless (with a head?), but when I plugged the Jetson in, the display did not turn on, and when I attempted it headless again, the device was not found.

I thought the problem could be with leaving the Jetson in the middle of set-up, so I attempted to re-flash the SD card, but find myself in the same stage.

To first confirm, if I re-flash Jetpack onto an SD card that has it, is this the same thing as factory resetting / restarting the whole process? This is what I would have wanted.

And if so, is there some way to resolve this issue? The fact that I can still re-flash the SD card makes me think the card is not the issue, and the Jetson does show a green light when it connects to power. Is it simply broken now? :/

The most reliable way is to make a connection to the Debug UART port UART2. You should see messages there when turning on the devkit.
You need an USB to 3.3V LVTTL UART adapter cable for the connection, and you will need putty (Windows) or picocom (Linux) or some other terminal software. Settings are 115200 bps, 8 data bits, no parity, one stop bit, no handshake.

Cable:
https://www.amazon.com/dp/B07RBKCW3S/

putty:
https://www.chiark.greenend.org.uk/~sgtatham/putty/latest.html

The pins to connect the serial cable in the devkit depend on the revision of the devkit. The earlier revisions have only one CSI2 camera connector, the newer ones have two.

The newer revision has got a 12 pin header names J50 unter the module. RX is on pin 3, TX is on pin 4, Ground is on pins 7, 9, 11. If you look straight onto the pins, pin 1 is the leftmost. Connect Devkit Ground to Serial Cable Ground, Devkit RX to Cable TX, Devkit TX to Cable RX.

If everything works you should get a login prompt after a while.

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