Below is a link to the current firmware version for older L-Series transmitters which originally shipped with v1.x firmware. This is series 7.x firmware, in which the "Nu Hybrid" compatibility mode replaces the old "400" mode used in previous versions of the product. "Nu Hybrid" mode conforms to the ETSI RF emission standard now in effect for wireless microphone transmitters in the US and Canada.
This is a zip file. After downloading extract the file into a temporary folder. Use the USB Firmware Updater program to update firmware.
Special note regarding LT and LT/E01 firmware:
The LT and LT/E01 models require different firmware loads. Do not install version 7.x series firmware in model LT/E01 transmitters!
Special note regarding older and newer LT transmitters:
Version 7.x firmware is not compatible with newer transmitters with version 6.x firmware. Do not install version 7.x firmware in transmitters with version 6.x firmware! In this case the higher version number (7 vs 6) does not imply upward compatibility or additional features.