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-VHF v6.00 - 11 October 2018
Introduces "Nu Hybrid" compat mode, which replaces the legacy "400" mode. "Nu Hybrid" mode conforms to the ETSI standard now in effect for wireless microphone transmitters in the United States. Version 6.x firmware is for use in units shipping with this FCC ID number:
All new product shipped after October 13th, 2018 to US customers will bear these FCC ID numbers and use 6.x firmware.
IFBT4-VHF v1.01 - 07 May 2018
Fixed a bug wherein it had been possible, via sustained key presses, to alter locked settings.
IFBT4-VHF v1.00 - 26 September 2015
First production release.