This model is not capable of firmware updates in the field so no files are available for download. Contact Lectrosonics if you need a firmware update.
IFBT4/E01-VHF v1.02 – 06 January 2025
Added 70, 100, 120, and 150 Hz options to the Low Frequency Rolloff feature.
IFBT4/E01-VHF v1.01 – 22 May 2018
Fixed a bug making it possible, with sustained key presses, to alter “locked” settings.
IFBT4/E01-VHF v1.0
First production release.