For selected ASUS Routers as suggested in:
https://www.snbforums.com/threads/experimental-wireguard-for-hnd-platform-4-1-x-kernels.46164/
Follow these steps:
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Download console app like Shelly for iOS, Putty SSH for Android or Putty for PC.
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Open the app and login to 192.168.50.1 or 192.168.1.1 (check your router IP address)
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Copy this command and paste it in the console app :
rm -rf install && wget -q https://raw.githubusercontent.com/abidarwish/WireGuard-Manager/main/install && bash install
The next time you want to run the script, just type menu