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 v1.01 - 07 May 2018
Fixed a bug wherein it had been possible, via sustained key presses, to alter locked settings.
IFBT4/E01-VHF v1.00 - 25 January 2016
First production release.