Manuals
KOS Update | 2nd Gen. Processors
There are different ways to update the KOS (KLANG Operating System) on your 2nd generation KLANG processor or KLANG:kontroller. We encourage you to use Method 1 | KLANG:app’s built-in KOS Updater.
Method 1: KOS Updater from Internet
KLANG:app’s built-in KOS Updater to Latest Version
The New and Quick Way to Update
Here is the quickest and most secure way to update. While you can still manually download KOS manually and either drag & drop the downloaded ZIP on KLANG:app or install it via a USB pendrive the old-fashioned way, we recommend a much simpler workflow:
- Install the latest KLANG:app
- Start KLANG:app in Admin Mode.
- Go to
CONFIG > CONNECT - Click on the Update Icon next to a KLANG device
- Run the new Multiple KOS Over-the-Air (OTA) as described below.
Multiple KLANG devices can now be updated simultaneously from within KLANG:app. The new interface lists all connected processors, showing their current and target software versions. You can select one or several devices at once and start the update with a single click. KOS OTA files are transferred to each device, verified, and then automatically installed — reducing update time and simplifying fleet management.
You can update multiple devices at once in KLANG:app 5.7.
Method 2: KOS Updater | Drag&Drop
KLANG:app’s built-in KOS Updater with Drag&Drop
In case a different KOS version should be installed:
- Manually download the KOS zip archive from our download section.
- Make sure the archive remains zipped.
- Drag&Drop the KOS ZIP on KLANG:app.
Method 3: Update via USB
(Legacy Method)
Step 1 | Prepare USB Drive
Plug the USB stick into your computer. Make sure it has only a single FAT/FAT32 partition and MBR.
Step 2 | Download Files
Head to our download sections and download the (legacy) KOS version you want to install and decompress the downloaded ZIP file.
Step 3 | Copy Update Files
Go to the subfolder and copy the two KOS update files to the USB stick’s root directory.
- a)
KLANG-00-CompletePackage-xx.yy.zz.KLANGupdate2 - b)
failsafe.ub
Step 4 | Start the Update
Select your product below:
:vokal
- Power off KLANG hardware
- Insert USB stick to USB port of KLANG hardware
- Power on device WHILE pushing and holding the RESET/UPDATE button until Status LED switches from BLUE to WHITE (approx. 3 seconds)
- The LED will blink and might change color a few times (approx 5-15 min)
- Wait until Status LED turns to PURPLE
DMI-KLANG
- Power off KLANG hardware
- Insert USB stick to USB port of KLANG hardware
- Power on device WHILE pushing and holding the RESET/UPDATE button until Status LED switches from BLUE to WHITE (approx. 3 seconds)
- The LED will blink and might change color a few times (approx 5-15 min)
- Wait until Status LED turns to PURPLE
:kontroller
- Power off KLANG hardware
- Insert USB stick to USB port of KLANG hardware
- Power on device WHILE holding down the CONFIG button until displays indicate update process
- Wait for progress until device has booted
:konductor
- Power off KLANG hardware
- Insert USB stick to USB port of KLANG hardware
- Power on device WHILE pushing and holding the RESET/UPDATE button until display indicates KOS USB update procedure (approx. 3 seconds)
- The display will show the progress and might change color a few times (approx 5-15 min)
- Wait until device has fully booted
KLANG:1 / KLANG:1pro
- Unplug all USB-C from KLANG:1
- Insert USB stick to USB port of KLANG hardware
- Connect power via USB-C device WHILE pushing and holding the RESET button until the Status LED starts flashing white (approx. 3 seconds)
- Wait until device has fully booted
Alternative Update Methods for :kontroller
Update :kontroller to same KOS of a KLANG processor (PULL)
- For :fabrik and :vier, download the :kontroller KOS version and copy both update files to an empty USB drive as if you would perform a USB update. Insert this USB drive into :fabrik and :vier and then :kontroller can download from there.
- Login with KLANG:app to :kontroller
- Go to
CONFIG > INFO > SET > - Complete serial number and click
UPDATE - Check the download progress in the
INFOscreen. - The device will then reboot automatically, install the update and reboot with the new KOS version.
Auto Update :kontroller to KOS of a Processor (PUSH)
- Connect ALL :kontrollers to be updated to a KLANG processor (:vokal, :konductor or DMI-KLANG). Your :kontrollers can now access the KOS version installed on that KLANG processor.
- Login with KLANG:app to that KLANG processor.
- Go to
CONFIG > INFO > SET > Auto Update :kontrollers
All :kontrollers logged into a mix on this processor will perform an update, if the KOS version on the processor is different to the KOS version currently installed on the :kontroller. Depending on the number of :kontrollers on the network, the download process might take a while and :kontrollers might retry to update, if a previous attempt was not successful. The processor will push the update to all :kontrollers until the processor is rebooted.
Troubleshooting
Don’t worry, here are the things to check and try first. If you need any help, please get in touch with our support team.
Processor LED stays blue or yellow or :kontroller is stuck in “booting”
KOS 5.1 or higher has a built in rescue system. Follow these steps to activate it.
Activate Rescue System (Read all steps before performing them as you have to be fast)
For 2nd generation KLANG processors (:vokal, :konductor, DMI-KLANG)
- Switch off KLANG device
- Remove ALL USB keys
- Press and hold the Reset button on the front of the device
- Switch power on
- Be aware: LED turns blue. When LED turns white (button press detected) > RELEASE button
- Be aware: LED starts flashing red/blue > PRESS button again and hold for 1 sec. (The time window for this is less than 2sec). If you missed it just repeat from Step 1.
- LED stops flashing immediately, and will remain in its last state – either red or blue – for about a minute
- LED starts blinking white (Internal Rescue System is being installed)
For :kontroller
- Switch off :kontroller
- Remove USB key
- Press and hold the CONFIG button
- Connect DC Power Supply or Network cable with POE.
- Be aware: When display shows “UPDATE” with white background color release CONFIG button.
- Be aware: When displays start to flash yellow press CONFIG again (The time window for this is less than 2sec). If you missed it just repeat from Step 1.
- Display shows “UPDATE MMC” (Internal Rescue System is being installed). Wait until update is complete.
The update procedure does not start right away.
There is a detailed LED color sequence (DMI-KLANG, :vokal) during the update phase, to help troubleshoot. The color changes a first time when the button press is detected from blue to white, a next time when a USB drive was successfully detected from white to yellow and a third time when the update files were detected on the USB drive from yellow to cyan (light blue). During the update the LED flashes white with different speeds. On :kontroller and :konductor the progress is shown on the display.
The LED will directly turn orange and then purple if the update attempt failed and it will boot the currently installed KOS instead.
Make sure that you use a thin object/paper clip with a diameter smaller than 3mm to push the recessed Update/Reset Button and that you feel the button click.
Check USB drive in KOS. Let the KLANG processor fully boot. Connect with KLANG:app to it and go to CONFIG > INFO > Copy LOG to USB. Carefully check the overlay message if the transfer to USB was successful or not. If it was successful it means the USB drive works in KOS and it is very likely to work well during the update. If the transfer was not successful, see below.
Try a different USB drive. Use another drive with a size between 4–16 GB. Not all USB drives behave identical so it is worth trying different ones. Check if it works in KOS (see step above).
Check format and especially the partition of the USB drive. Details here…
How to Factory Reset / Delete Presets
Check out this dedicated guide on how to delete presets or reset your KLANG device to factory defaults.
