FRITZ!OS 8.50 Adds Failsafe Support to 4G and 5G Routers

2 October 2026 · 3 min read · 618 words · 4G Broadband

German networking equipment manufacturer FRITZ! has begun rolling out FRITZ!OS 8.50, a software update that brings failover protection capabilities to its 4G and 5G FRITZ!Box mobile broadband routers, along with enhanced security, smart home automation, and network management tools. According to ISPreview, the update focuses on improving stability and security across FRITZ! home networking products.

FRITZ!Box routers are bundled by several UK broadband ISPs.

FRITZ!Failsafe Now Available on Mobile Broadband Models

The headline feature of FRITZ!OS 8.50 for mobile broadband users is the introduction of FRITZ!Failsafe — the company's failover protection system — to FRITZ!Box 4G and 5G models. For the first time, these mobile broadband devices can also connect to the internet over a LAN port, such as through an upstream fibre ONT (optical network termination).

When a primary landline connection fails, the mobile broadband connection temporarily takes over to maintain internet provision across the home network.

Enhanced Network Security and Filtering

FRITZ!OS 8.50 introduces a new DNS filtering capability that allows the FRITZ!Box to block access to unwanted internet domains directly at the network level. The FRITZ!Box supports common standards to read in and process lists of undesirable domain names, enabling users to filter advertising, trackers, malware, phishing pages, botnets, and other undesirable content.

Users can resort to publicly available DNS filter lists to filter content. When a device on the home network calls up a blocked address, the FRITZ!Box blocks the query automatically. This feature is initially rolling out to the FRITZ!Box 7690 model, with expansion to other select models planned during the gradual rollout.

The update also includes a new Smart Check feature within the MyFRITZ!App, which displays the current health status of the FRITZ!Box on the app's home screen. Smart Check provides status monitoring across internet, telephony, home network, Wi-Fi, LAN, USB, smart home, and security functions, along with actionable recommendations and warnings.

Automatic Application Prioritisation for Video and Gaming

In addition to existing device-level prioritisation, FRITZ!OS 8.50 adds automatic application-level prioritisation. The FRITZ!Box automatically detects applications such as video conferencing and gaming, and prioritises them within the home network to maintain stable connections.

When automatic prioritisation is active for an application, the FRITZ!Box user interface displays the active prioritisation for the relevant network device and this can be retraced up to 24 hours later. This feature is being rolled out to select FRITZ!Box models over the coming weeks.

Expanded Smart Home Automation and Energy Management

FRITZ!OS 8.50 extends automation capabilities for FRITZ! smart home devices. The FRITZ!Smart Energy 200 and 210 smart plugs, as well as the upcoming new indoor model FRITZ!Smart Energy 201, can now be configured to automatically switch off if they exceed a specified current limit for a set duration.

Users can create preconfigured automations such as 'Leaving the House', 'Coming Home', and 'Holidays' with simple clicks, triggered by smartphone geofences configured in the FRITZ!App Smart Home. A forthcoming update will allow routines to combine multiple triggers, enabling scenarios such as activating automations only when all household members have left.

The FRITZ!Box 5690 Pro can now function as a Matter bridge, integrating all registered FRITZ! smart home devices and compatible devices from third-party manufacturers into existing Matter networks from Apple Home, Google Home, or Amazon Alexa. Users can benefit from voice controls.

Rollout Schedule and Availability

FRITZ!OS 8.50 is being rolled out gradually, beginning with the FRITZ!Box 7690. Updates for other older models, as well as for Wi-Fi repeaters and mesh sets, will follow gradually. The update will be installed automatically for users who have enabled that feature; otherwise, updates can be requested manually via the fritz.box user interface.