Registering ZenWifi ET8 while i lost the box

[malraie3]

System: Windows
Battery or AC: AC
Model: Zenwifi ET8
Frequency of occurrence: N/A
Reset OS: N/A
Screenshot or video: N/A
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Detailed description： I would like to register my ET8 but I lost the box how can I do so as when I try with both serial numbers it states an error.

[GEEK_ASUS]

Hi there,
For the registration issue of your Zenwifi ET8, please contact our call center to have further assistance.
ASUS - Contact UsThank you.