@NewUser100 Instead of L2TP VPN, try OpenVPN. For the Central Office, set up the OpenVPN Server in Full Mode, and set up the remote office as the OpenVPN Client. Just make sure the Server End is set...

@PasLu Are both APs showing this issue? Are they meshed together or just in standalone? Also can you provide the firmware versions of all devices?

@Peppershade Can you check the firmware version of the device for me? It looks like the most recent update was back in July.

@Domada If it's a U.S. model, looks like there's an update on the website. Here's the download file for you. As for the WLAN security settings, thanks for that picture. Can you confirm all of your...

@Domada Can you share the security settings being used for your WLAN? Also, would it be possible to update the firmware of the router as well?

@Kamillll Would it be possible to enable and disable the USB Modem port as well? Also, was this feature previously working or is this the first time configuring the Link Backup feature?