If you run into problems with echo or audio distortion on Konftel 300Wx you can use below firmware.

For use with Konftel Upgrade Utility:

https://upgrade.konftel.com/download/konftel_300wx/2_0_10/upgrade.kt


Make sure to download and install Konftel Upgrade Utility first, found here:

https://upgrade.konftel.com/download/konftel_upgrade_utility/Konftel_Upgrade_Utility.zip

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For use with SD card:

https://upgrade.konftel.com/download/konftel_300wx/2_0_10/sd/upgrade.kt


If you still are having audio issues with the 300Wx please contact us using this form:

https://www.konftel.com/en/contact-support