How to find old firmware/firmware?

Good morning

I have a Internet-Box plus that I use as a WiFi repeater on the top floor of a four story building. Since the router does not have a direct connection to the internet, the firmware does not update automatically.

It’s currently in 08.08.26, and to upgrade to 10.01.42 I need to go through an R09 firmware first. Can anyone tell me where I can find some?

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4 days later

I believe that there is not a web page where you can find the updates, in my opinion the best thing to do is to connect it directly with the purple socket as the main router, do the update from the HUD of the router (192.168.1.1) and after putting it back on the 4th floor as a repeater

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