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Info on FRITZ!Box 6820 LTE

The update file "FRITZ.Box_6820_LTE.142.xx.xx.image" on contains the latest FRITZ!OS (Firmware) for the FRITZ!Box 6820 LTE.

Attention: This update file is only intended for use with FRITZ!Box 6820 LTE!
Please follow the instructions at the end of this file to install the update.

Product: FRITZ!Box 6820 LTE
Version: FRITZ!OS 6.83
Language: English, French, Italian, Spanish, Polish
New functions : - FRITZ!Hotspot: the wireless guest access with additional functions for cafés, shops and practices (captive portal)
- Reservation of data rates
- Extra security and network adjustments
- Option for loading the previous LTE modem software
- Necessary adjustments to changes in the Telefonica network configuration (O2/E-Plus)

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 and improved Features in FRITZ!OS 6.83

NEW: Option for loading the previous LTE modem software
NEW: New software version for the LTE modem
NEW: TR069 query parameters supported for LTE connection
NEW: Text reception supported -- texts received output as event

NEW: Guaranteed data rate for home network devices despite intensive use of the guest network
NEW: Option for autonomous port sharing (UPnP/PCP) can be enabled for each device

Home network:
NEW: IP address (DHCP) can be changed directly in the device details

NEW: FRITZ!Hotspot - the wireless guest access with additional functions for cafés, shops or practices: Captive portal with own logo, text and link to own homepage.
Details at

NEW: New convenience features added to user interface and optimized display on smartphones and tablets (responsive design)

NEW: Certain settings and features require additional confirmation by the user where the FRITZ!Box is located


Priorities in WiFi
With the FRITZ!OS 6.80 update users can be sure to surf, stream or chat without interference even if the guest network is highly used. So you can decide which transmission rates you and your guests are entitled to. If the FRITZ!Box owners are not online, the guests can enjoy higher data rates.

Even better and easier: MyFRITZ! for browser and app
Following the user interface - the window to the FRITZ!Box - with FRITZ!OS 6.83 the user interfaces of the MyFRITZ! service ( and FRITZ!NAS now also appear in a responsive design and adjust to any display size. Using the MyFRITZ!App 2 (for Android) users have convenient access to their FRITZ!Box - at home and from anywhere else. With a single swipe you can establish a secure connection to your home network and access your FRITZ!Box and connected devices from on the go.

On the safe side: strong passwords and settings requiring confirmation
The saving of backup files and the changing of certain settings are even safer now, as a new function implements an additional confirmation that can only be verified where the FRITZ!Box is located (two-factor authentication). Attempts to log in with wrong user data are recorded as an event. Numerous other FRITZ!OS 6.83 upgrades provide the FRITZ!Box with the latest security standards. With every large update AVM always advises to install the latest version of FRITZ!OS for optimum security and best network synchronization.

Approve access from the Internet for online games, gaming consoles or IP devices
Devices connected to the FRITZ!Box are safe from unauthorized access from the Internet. However, certain applications such as online games or devices like IP cameras or gaming consoles sometimes need to be accessible for others over the Internet. FRITZ!Box users can enable such connections through port sharing. Now it's also possible to allow certain devices to control port sharing automatically. With FRITZ!OS 6.83 all shared ports (IPv4, IPv6, MyFRITZ! or autonomous) can be viewed and configured at once. Users can find an overview of all shared ports with their connected home network devices in the menu at "Internet" "Permit Access". Settings for parental controls can also be used with pure IPv6 devices with the new FRITZ!OS 6.80.


Additional improvements in FRITZ!OS 06.83

Improved: Consideration of changes in the Telefonica network configuration (O2/E-Plus)
Improved: Expanded diagnostics function for LTE
Improved: Optimized stability
Improved: Various optimizations for modem behavior
Improved: Timeouts in response to missing network responses optimized
Improved: Increased robustness in case of reconnect
Improved: Better error handling upon attach

Improved: Display of online time in the parental controls overview
Improved: Labeling of time axes in the Online Monitor
Improved: Filters for websites take account of blocked domains for https calls as well
Improved: Support for pure IPv6 devices in parental controls
Improved: Port sharing combined with MyFRITZ! sharing and IPv6 sharing
Improved: Complete firewall exceptions possible for downstream routers with IPv6
Improved: Static routes can be defined for IPv6
Improved: Faster surfing through optimized treatment of DNS queries
Improved: IPTV stability when used simultaneously via LAN and wireless LAN
Remedied: After reconnecting via LTE, the connection was sometimes not resumed correctly on the IP layer
Bug fix: Shifted time scale in the graphic overview of permitted online time on

Home network:
Improved: Display of device details completed
Remedied: "Deleting" unused devices in the home network list also removes VPN connections

Wireless LAN:
Improved: Shows the last time when auto-channel was refreshed
Improved: Deletion of all inactive wireless devices without individual settings from the list of known wireless devices
Improved: Scheduled switching settings optimized for smartphone and tablet
Improved: Better stability

Improved: Diagnostics of "Function" and "Security" includes MyFRITZ!
Improved: Optimized registration of MyFRITZ! account

Improved: Attempts to log in with wrong user data recorded in Event Log
Change: Registration with FRITZ!Box user interface valid for 20 min
Change: Increased security of FRITZ!Box's own certificate through signature with SHA 256

Improved: Optimized configuration of switching schedule by graphic time table for smartphone and tablet
Improved: FRITZ!OS update page also shows the last time the version was checked or the last time a FRITZ!OS was installed
Improved: Event log adjusted to different display sizes
Improved: User guidance for restoring saved settings
Improved: Push service overview
Improved: Reworked mail subject line for push service mails and information about sender
Improved: Text edited in the FRITZ!Box Info mail from push service
Improved: Push service combines mails generated within a short period
Improved: Change notices for selected settings added to push service mails
Improved: Push service mail for use of guest access even when wireless network login/logout display disabled
Improved: Information on full storage medium for push service mails on function diagnostics
Improved: Important notifications for secure and reliable operation now also via MyFRITZ!App 2 and by push service mail (Previously: only red Info LED and overview)
Improved: Better stability even in atypical load situations
Bug fix: Recurrent push mails (change notices) about first registration of powerline devices or devices without a clock
Change: Interface descriptions for developers expanded (

We recommend every update for reasons of security as well. Further improvements to increase security with this version of FRITZ!OS are presented at in the area "Updates increase security".


New in FRITZ!OS 6.51

NEW: in the initial setup of the Internet connection is first attempts to establish a connection to an LTE cell


New in FRITZ!OS 6.50

NEW: First configuration wizard determines an entry from the list of known Internet providers that fits the SIM card.
NEW: LTE frequency band selection expanded to include any number of subsets
NEW: 7-day statistics added for mobile communications connection
NEW: Mobile radio modem displayed separately in the Energy Monitor
NEW: Real-time monitor also available for UMTS and GSM
NEW: Provider name from the PNN field of the SIM card also considered

NEW: List of Internet providers revised and expanded
NEW: Individual name added to designate "Other Internet provider"
NEW: Display of a longer Internet disruption (red "Info" LED and on "Overview" page of the user interface)
NEW: Rates with PPP authentication now also supported via "Other provider" in the first configuration wizard

NEW: Option for granting Internet access via the guest access only after consent to terms of use (captive portal)

NEW: "Change notice" push service notifies about changes to selected settings and events
NEW: Push service sends mail with status after successful update (effective after next update)
NEW: Display of important notifications for secure, reliable operation with red "Info" LED and on the start page
NEW: Check for available firmware update at conclusion of first configuration


Improvements and Bug Fixes in FRITZ!OS 6.51

Improved: new modem firmware with improved connection stability


Improvements and Bug Fixes in FRITZ!OS 6.50

Resolved: PUK/PIN entry after three incorrect attempts corrected
Improved: New modem firmware
Improved: Detection and handling of errors in mobile communication connection
Resolved: Error during network search in the context of some 2G-only SIM cards
Resolved: Information on second DNS server was not transmitted from the LTE modem to FRITZ!OS
Resolved: Connection status sometimes unclear after an existing connection switched to UMTS

Change: Roaming option moved from "Advanced" to "Standard" view
Resolved: Internet connections not possible when PPP authentication required
Resolved: No function for IPv6
Resolved: Prioritizations could not be created
Resolved: After reboot, LAN traffic sometimes not forwarded to the WAN via the correct route

Improved: Increased wireless throughput
Resolved: Incorrect settings dialogs and displays in the Wireless configuration and in the Wireless Monitor
Resolved: Occasionally only half of the wireless throughput actually possible achieved on certain channels
Improved: Check for consideration of any existing regulatory guidelines for wireless LAN expanded to all country guidelines. The following countries were added to the check procedure: Ireland, Montenegro, New Zealand, Namibia, Nigeria, Norway, Poland, Sweden, Slovakia, Tanzania, Thailand, Uganda, Cyprus
Resolved: Wireless without function when Namibia selected as country
Resolved: Configuration error eliminated when guest AP enabled

Home network:
Improved: Various optimizations in the views of the home network overview
Resolved: Fixed assignment of the same IPv4 address lost on restart

Change: Update with a FRITZ!OS file is permitted only with the latest version of FRITZ!OS
Resolved: Language selection in first configuration not applied in password dialog
Resolved: "Poland" missing as country in country selection
Resolved: Push mail did not contain consumption graph
Resolved: Firmware update sometimes failed when wireless LAN enabled

We recommend every update for reasons of security as well. Further improvements to increase security with this version of FRITZ!OS are presented at in the area "Updates increase security".

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.
© AVM GmbH 2004-2017. All rights reserved.

This AVM firmware package contains files that are propagated under different licenses, in particular under a license held by AVM 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 (
The source code of the files propagated as open source files can be obtained upon a written request to

AVM grants the non-exclusive right to use this AVM 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.
AVM reserves all rights that are not expressly granted to the licensee. Without previous approval in writing, and except for in cases permitted by law, it is particularly forbidden for this AVM firmware packet to be
- copied, propagated or in any other manner made publicly accessible, or
- processed, disassembled, reverse engineered, translated, decompiled or in any other manner "opened" and subsequently copied, propagated or made publicly accessible in any other manner.

TVI, SRi 2017-03-16