Unfortunately, GL iNet does not and never has handled upgrading configurations between firmware versions, and after seeing many request for this feature over the years, I don't think they will ever fix it. I am sure it is a business decision where the cost vs potential to sell more routers does not support the work. If people stop buying routers with poor update support, maybe this would change.

Many of us who own and support multiple GL iNet routers have had to build our own backup and restore procedures. This saves me a lot of time during upgrades, and several times when I have had to downgrade due to bugs in the new firmware,it is nice to have the old configuration saved, so I can just drop it back in.