LCOS SX Release

LCOS SX logo

New power for your switches

The operating system for LANCOM Switches - the LCOS SX - continuously receives innovative new features and improvements due to our in-house development. This guarantees that your internal networking is always state-of-the-art! Download the right SX version for your device now and benefit from new features and improvements.

Download of the current version

You will find the current LCOS SX release version as well as all active predecessor releases in our download portal. Simply enter your desired product and download the software free of charge!


Feature highlights

LCOS SX 5.20 Rel features

For switches of the XS and GS-4500 series
  • Firmware integration of the stackable access switch series GS-4500
  • Support of the Stacking and LAG (Link Aggregation Groups) functions in the LANCOM Management Cloud
  • Configuration of PoE ports on GS-4554XP and GS-4530XP via the LANCOM Management Cloud
  • Switch Config Notifier – as of 5.20 REL, local configuration changes of the switches of the XS and GS-4500 series are reported to the LMC and changed parameters are taken into account by it in the detailed configuration
Collage of LANCOM XS-switches with LCOS SX 5.20 logo
LCOS SX 4.00 collage

LCOS SX 4.00 RU7 features

For switches of the GS-3100 and GS-3500 series
  • Activation of the LMC pre-configuration of the GS-3152P.
  • Fix of a vulnerability in the OpenSSL library (CVE-2022-0778)
  • Fix of the default route when configuring a fixed IP via the LMC
  • Fix of a possible connection loss to the LMC in case of IP fallback including static default route
  • Fix of the transfer of LAG groups (LACP) created via LMC into the running config or startup config of the switch

LCOS SX 3.34 Rel features

For switches of the GS-1300 and GS-2300 series
  • Configuration of the Spanning Tree Protocol (STP) now possible from the LMC
  • Fix for a vulnerability in the OpenSSL library (CVE-2022-0778)
  • Fix for a vulnerability in the zlib library (CVE-2018-25032)
  • Improvement and a new authentication mode 'MAC-based' single auth` for 802.1X RADIUS
  • Erasing of persistent event and boot logs now possible from the debug menu (debug; erase persistent-logs)
Collage of LANCOM GS-2300 switches with LCOS SX 3.34 logo

Further information

Software lifecycle management

With LANCOM Systems you have a manu­facturer at your side who offers unparalleled investment protection. The lifecycle policies from LANCOM also provide full transparency and reliable planning with regard to the firmware updates and product support for your LANCOM infrastructure.

Overview of firmware versions

Keep track of our current OS versions with our firmware version overview. It provides a comparison of the different versions and recommended usage.

LANCOM software release process

Our aim is the optimal preparation of our in-house operating systems LCOS, LCOS SX, LCOS LX, and LCOS FX and other software, not only for its use in practice, but also to adapt it to the wishes of our customers. This is why we enter into active dialog with our customers even during the development phase as part of our release procedure.

LCOS SX download

Before upgrading your device to a new firmware it is essential to backup your device’s configuration. Due to extensive features it is not possible to downgrade to a previous firmware without using the backup configuration. Never disconnect the device from power supply while updating the firmware. In this case the device won’t start again.


Your direct line to us

Most questions can be resolved best in direct contact: We look forward to answering your questions and requests by phone or via the contact form.

Inside Sales International Team
+49 (0)2405 49936 122

Feel free to write us