It had 2.0.4 earlier this evening which is what it had when I bought it. https://openwrt.org/inbox/toh/ubiquiti/ubiquiti_edgerouter_x_er-x_ka suggested going down to 1.10.10.
I have factory files from here https://github.com/stman/OpenWRT-19.07.2-factory-tar-file-for-Ubiquiti-EdgeRouter-x/tree/master/Version%2022.03
In both 2.0.4 and 1.10.10 ssh or UI I get told the image is not acceptable.
Checking upgrade image...Upgrade image does not support the device. Upgrade failed.
https://github.com/stman/OpenWRT-19.07.2-factory-tar-file-for-Ubiquiti-EdgeRouter-x/issues/4 says the same and that serial worked.
I do not currently have a serial adapter. I haven't used one since the db9 days...... what should I buy? Or is there are a way that works without cracking the case?