The update file contains the latest FRITZ!OS (Firmware) for the FRITZ!Box 6825 4G. **Attention:** This update file is only intended for use with FRITZ!Box 6825 4G! Please follow the instructions at the end of this file to install the update. ``` Product: FRITZ!Box 6825 4G Version: FRITZ!OS 8.25 Language: German, English, French, Italian, Dutch, Polish, Spanish Release date: 02/07/2026 ``` **New features:** ------------------------------------------------------------ - The new Online Monitor offers a clear graphical overview of the internet usage of top consumers and selected home network devices - Mesh optimization - for greater stability and improved data throughput, FRITZ!Repeaters independently select the ideal connection in the Mesh - Simplified user guidance for the parental controls - access profiles and the home network devices assigned to it are now clearly displayed - Reduce the FRITZ!Box's energy consumption with EEE (Energy Efficient Ethernet) Can now be individually configured for the LAN sockets ------------------------------------------------------------ With each FRITZ!OS update, FRITZ! also updates its security functions. Therefore we recommend performing the update for all devices. ------------------------------------------------------------ Note: Instructions for configuring and using Mesh functions are presented at en.fritz.com/mesh-faq Below you find a complete list and descriptions of the new functions in the latest FRITZ!OS, along with a list of further improvements in this version. ------------------------------------------------- # New features and improvements in FRITZ!OS 8.21 ------------------------------------------------- ## Mobile Network: - **Improvement** New software for the mobile modem with improved mobile connection stability - **Improvement** Method for determining band share and band capacity revised - **Improvement** Initial startup phase after device restart until a mobile connection is established has been shortened - **Improvement** Detection and handling of mobile network errors has been revised and optimized ## Internet: - **NEW** Online Monitor shows the network devices with the highest utilization of the internet connection (top consumers) - **NEW** The Online Monitor for "individual devices" also displays the total current utilization of devices that were not selected individually - **NEW** Simplified user guidance on the "Filter" pages (parental controls) - **Improved** In the Online Monitor the display of the utilization of the internet connection allows selection of not only one day or two months but also an interval of 2 weeks - **Improved** Device selection for display and data recording simplified in the Online Monitor - **Improved** Reworked diagrams and colors in the Online Monitor - **Improved** Online Monitor: Reworked display in the diagrams for the utilization of the internet connection - **Improved** Improved stability when there are many simultaneous requests to internet services - **Improved** Port 443 (HTTPS, QUIC) is taken into account when the network application "Surfing" is prioritized - **Improved** In the access profiles for parental controls, it is now possible to select whether network applications should be blocked or allowed - **Improved** Number of tickets to extend online time for devices blocked by parental controls was increased from 10 to 12 - **Improved** In the parental controls, limited online time for a network device can now be easily extended by 45 minutes ## Mesh: - **NEW** Automatic detection of device type (e.g. smartphone, computer, or printer) for devices displayed in the Mesh Overview - **NEW** Intelligent networking: FRITZ! products in the Mesh assess and optimize the connections among each other - **NEW** Simplified login to Mesh Repeaters via the Mesh Overview of the Mesh Master ## Home Network: - **NEW** Save energy in the home network: EEE (Energy Efficient Ethernet) can now be set separately for each WAN/LAN port - **Improved** Completely reworked network settings for improved user-friendliness ## Security: - **Improved** Push mail now also sends notifications about logins from FRITZ!Apps ## System: - **Improved** File name for saved settings now includes name of individual FRITZ!Box - **Improved** The "Diagnostics > Function" page now displays information on problems with time synchronization via NTP - **Improved** If the configured/provisioned time server fails, automatic switch to public server - **Improved** "Forgot Password" function of the push service can now be configured with a freely chosen recipient - **Improved** Functional diagnostics now indicates when access for apps (TR-064) is disabled in the home network sharing settings - **Improved** Reworked pages of the update functions under "System > Update" - **Improved** Reworked user guidance for backing up or restoring settings - **Improved** Warning on the overview page when push service is interrupted - **Improved** Push service emails now clearly differentiate between function and security diagnostics through specific subject lines, adapted email texts, and file names - **Improved** Accessibility support for FRITZ!Box and FRITZ!Mesh Set Master (in accordance with GAA Ordinance) ------------------------------------------------------------ # Additional Improvements in FRITZ!OS 8.25 ## Mobile communication: - **Improvement** New software for the mobile modem with improved mobile connection stability ## Internet: - **Improved** Better interoperability with newer browser versions - **Improved** Operation of schedules in the parental controls reworked for small displays (smartphones, tablets) - **Fixed** IPv6 addresses were not displayed in full in the overview of WireGuard® connections - **Fixed** Incorrect error handling during storage of prioritization rules - **Fixed** Internet access (remote access) to the FRITZ!Box could be configured only while the FRITZ!Box was connected to the internet - **Fixed** The summary of individual access profiles for parental controls displayed "No restriction" despite restrictive settings - **Fixed** When the standard profile in the parental controls was blocked, sometimes authorized devices could no longer register with the Wi-Fi network - **Changed** Root certificate added for DNS over TLS with SSL.com ## Home Network: - **Fixed** In certain scenarios, unnecessary entries for switches (FA:CE:...) were displayed in the idle connections section - **Fixed** In special scenarios it was possible for the IP address 192.168.178.1 to be displayed for an extender in the home network instead of its own address - **Fixed** Names of home network devices were occasionally assigned incorrectly - **Fixed** Under some circumstances active devices with static IP addresses were displayed as inactive and vice versa ## System: - **Improved** Robust error handling during update search - **Improved** Simplified setup: When setting up international products, it is no longer necessary to restart after selecting country and language - **Improved** Stability - **Fixed** For very slow internet connections it could happen that a FRITZ!OS update via the user interface was interrupted before completion - **Fixed** Under "Network Connections" in the FRITZ!OS interface, "connected with FRITZ!Repeater" was sometimes shown twice ------------------------------------------------------------ # Additional Improvements in FRITZ!OS 8.21 ## Internet: - **Changed** FRITZ! devices in the home network, e.g. FRITZ!Repeaters, are no longer offered in parental controls and prioritization; they always have unrestricted internet access with normal priority - **Changed** Private IPv4 addresses (RFC 1918) are no longer posted via MyFRITZ!Net (DNS) if a publicly accessibly IPv6 address is available - **Changed** When VPN connections are active for which all network traffic is routed via the VPN connection ("full tunnel"), the guest network is excluded from this and routed over the normal internet connection - **Changed** Number of network devices for which the saving of internet data rates can be enabled was increased to 40 - **Fixed** Enabling the UPnP filter had no effects for IPv6 - **Fixed** For providers without support for IPv6, the Online Meter did not count consumption values as long as IPv6 was enabled in the account information of the FRITZ!Box - **Fixed** Possible internet disruptions when using a large filter list for blocked websites - **Fixed** For FRITZ! devices operated exclusively via IPv6, under some circumstance there was no search for new FRITZ!OS versions (updates) - **Fixed** Creation of new WireGuard® VPN connections could fail if many WireGuard® VPN connections had already been created - **Fixed** Under certain circumstances, a FRITZ! device operated exclusively via IPv6 could not obtain the system time via the Network Time Protocol - **Fixed** The rate information in the Online Meter showed an incorrect end of the billing period - **Fixed** Parental controls: Redeeming tickets to extend online time failed in certain scenarios - **Fixed** Potential incorrect display in the Online Meter of the use of data capacity during the billing period ## Home Network: - **Fixed** In rare cases the information on a new network device in the home network was not immediately entered in the event log or change notice - **Fixed** In special scenarios it was possible for the IP address 192.168.178.1 to be displayed for a repeater in the home network instead of its own address - **Fixed** "Home Network > Network Connections" page was not displayed (empty page) when a FRITZ!Box was configured as an internet gateway and a Mesh Repeater ## System: - **Fixed** Push service sent the Forgot Password link of devices configured as IP clients with the incorrect IP address - **Fixed** Despite correct rate settings, the "Info" LED did not flash when online volume exhausted - **Fixed** Preview of personalized subject line from push service shows the suggested parentheses only if they were actually entered ------------------------------------------------------------ --- initial FRITZ!OS version --- FRITZ!OS 8.20 ------------------------------------------------------------- ##Information on the Mesh Feature ------------------------------------------------------------- General information on Mesh is presented at en.fritz.com/mesh-networking. ------------------------------------------------------------- **Enabling the Mesh Function** To check whether a FRITZ! product is enabled for Mesh, see the "Mesh Overview" of the FRITZ!Box (the Mesh Master) under "Home Network / Mesh". Here the products in the Mesh are designated with a corresponding "Mesh active" icon. A FRITZ!Repeater or FRITZ!Powerline adapter with FRITZ!OS 6.90 or higher installed can be enabled for Mesh in various ways: - If the product has the factory settings configured and is being connected with the FRITZ!Box for the first time, it will be automatically enabled for Mesh. - If the product is already connected, but not enabled for Mesh, it is added to the Mesh by pressing a button on the product to be integrated and a button on the FRITZ!Box. On the FRITZ!Box, use the button that initiates WPS (depending on the model, press the "Connect" or "WPS" button briefly, or the "WLAN/WPS" button for 6 seconds). Detailed instructions, additional information and the answers to frequently asked questions about Mesh are presented at en.fritz.com/mesh-faq. ------------------------------------------------------------- **Configuring a Second FRITZ!Box as a Mesh Repeater with the Press of a Button** Prerequisites: - Your existing FRITZ!Box supports Mesh (FRITZ!OS 6.90 or higher). - The FRITZ!Box to be deployed as a Mesh Repeater has been updated to FRITZ!OS 7.0 and you have restored its factory settings. Here's how: - Connect the port "LAN 1" of the Mesh Repeater with the Master using a LAN cable. - Initiate the Connect function on both boxes (7590: press the "Connect" button briefly; 7490: press and hold down the "WLAN/WPS" button for 6 seconds). After the connection procedure is concluded, the second FRITZ!Box is ready for operation as a Mesh Repeater. (It is operating in "IP client" mode and, as a Mesh Repeater, adopts the wireless LAN settings and other important settings from the FRITZ!Box). Please note that this function can be used only if the second FRITZ!Box is permanently connected with the first box by LAN cable. If you received the second FRITZ!Box from your internet provider, the automatic configuration of this feature might not be possible. In this case, configure this FRITZ!Box manually in the user interface as Mesh Repeater. For instructions, see en.fritz.com/mesh-faq. ___________________________________________________________ Instructions for installing the update: Use the update function offered in the user interface to install the update. This automatically offers you the right FRITZ!OS. Click "Wizards", select "Update" and then follow the instructions on the screen. ___________________________________________________________ © FRITZ! GmbH 2004 - 2026. All rights reserved. This FRITZ! firmware package contains files that are propagated under different licenses, in particular under a license held by FRITZ! or under an open-source license (namely the GNU General Public License, GNU Lesser General Public License or FreeBSD License). For details on the various licenses, see the "license.txt" file (https://download.avm.de/fritzbox/license.txt). The source code of the files propagated as open source files can be obtained upon a written request to fritzbox_info@fritz.com. FRITZ! grants the non-exclusive right to use this FRITZ! firmware package, which is supplied exclusively in object code format. The licensee may create only one copy of the software, which may be used exclusively for backup use. Without previous approval in writing, and except for in cases permitted by law, it is particularly prohibited to -copy, propagate or in an other manner make the FRITZ! firmware package publicly accessible, or- process, disassemble, reverse engineer, translate, decompile or in any other manner open the software and subsequently copy, propagate or make the firmware publicly accessible. TVI 2026/07/02