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After having worked 6 years and 24/7, my EdgeRouter Lite 3 have definitely died. I want to replace it by a new EdgeRouter 4.

Can I easily use my EdgeRouter Lite 3 backup files and import it to a new Edge Router 4 ? Will I find the same configuration on the ERL-4 first three ports?

I think yes, because ERL-3 have only 3 ports, and ER-4 have one more. The fourth port will not be used for the moment.

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    My EdgeRouter Lite 3 has died several times. Each time it's brought back to life by replacing the internal USB drive that it uses. Using something like dd to copy it over (dd-rescue if needed) has usually worked, though I've also had to resort to rebuilding the full image from a firmware download. Thankfully this project at github.com/sowbug/mkeosimg can combine the firmware with an exported config to get you back up and running really quickly.
    – Adam
    Commented Sep 6, 2021 at 15:32

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Unfortunately, your question is not fully allowed here due to the device manufacturer (Ubiquiti) not offering any sort of paid support option.

However, as a generic/brand-agnostic question, if you can export the config to a flat text file, yes, you can move between models. You will likely have to account for making a few changes, though, such as interface names and numbering’s being potentially different (FastEthernet to GigabitEthernet, or 1/1 to 0/1). As long as you pay attention to stuff like that, you should be safe.

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    I’m sorry about that ! So I’m going to ask my question on the manufacturer’s forums. The ERL-3 backups files are zipped. When I unzip and open a file, I have a lot of files and directories, but one called config.boot seems to contain all the configuration in text format (firewall rules, interfaces, static mapping...). Between the two routers, interfaces names must be the same I guess. If not, I just need to edit the configuration in text format with the new interface names. Do I understand correctly ?
    – Loraga
    Commented Sep 6, 2021 at 15:27
  • @Loraga Pretty much. Having worked on a few Ubiquiti devices before, I know that the switches can be managed via CLI (not just the web UI) so I’m assuming their routers can as well. If so, you can dump the output to a flat text file that way rather than using the web UI’s export option.
    – Jesse P.
    Commented Sep 6, 2021 at 15:29
  • I have successfully restored ER-3 configuration on my new ER-4. There is just two little things to do after backup. Must I post solution as answer here ?
    – Loraga
    Commented Sep 22, 2021 at 11:50
  • @Loraga If you’d like to, you can.
    – Jesse P.
    Commented Sep 22, 2021 at 11:51
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There is no problem migrating from an ERL3 to an ER4 because interfaces names between these routers are the same.

After migration, we have to manually create the interface eth3 (because eth3 doesn't exist on EdgeRouter Lite) like this :

configure
set interfaces ethernet eth3 speed auto
set interfaces ethernet eth3 duplex auto
commit
save

After that, reboot EdgeRouter a couple of times and everything will work perfectly.

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