With every upgrade, do not keep settings. This will result in a default configuration after each upgrade. This is necessary… keep in mind that you must be connected by Ethernet and the address of the router will be 192.168.1.1
- Upgrade to 18.06 from 17.01
- Then upgrade to 19.07 - this will involve a change from the old ar71xx target to ath79, which will have a scary message. Okay to proceed, just make sure you downloaded the correct image and that the checksum matches with the website.
- now jump to 22.03
- finally 23.05
You cannot import your old settings - they are not compatible. Make a backup and use that as a reference (human readable, not to restore to the system)