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The company uses a Zyxel EX5501 (as labeled), but it's running Arris firmware (likely a dreadful carrier-customized version), which is extremely difficult to use. It doesn’t allow changing the WiFi name or password, only functions as an AP, can’t assign IP addresses, and the backend is very hard to access—I had to search through a ton of resources online just to get in. Worst of all, the upgrade page only allows firmware uploads smaller than 8MB. This isn’t a half-finished product; it’s junk. How can I flash it back to the original Zyxel firmware?

 

Almost nothing can be configured.

 

 

You’d have to contact Zyxel about firmware change options. I doubt they have anything. I’d probably look at replacing it. ISP supplied devices like this aren’t exactly known for their performance. 

Arris supports only the retail products that are available on surfboard.com but not the ISP lease products. 
Please contact your ISP for further assistance.

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