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 v2.1 – 06 January 2025
Added 70, 100, 120, and 150 Hz options to the Low Frequency Rolloff feature.
IFBT4 v1.5 – 18 September 2013
Added full frequency block 23 coverage for Australian export models.
IFBT4 v1.4 – 26 September 2008
- Added external power voltage readout feature and automated warnings if voltage is out of range.
- TV channel is now correctly reported on blocks 470 and 19.
IFBT4 v1.3 – 22 January 2008
- Replaced subsonic filter with a quieter one, for a slight improvement in noise performance.
- Enhanced support for frequency block 944, added support for frequency blocks 470 and 19.
IFBT4 v1.2 – 13 June 2007
Added support for frequency block 944.
IFBT4 v1.1 – 28 March 2007
Made changes to certain factory testing functions for ease of manufacturing. There is no change to features or performance.
IFBT4 v1.0 – 11 January 2007
First production release.