Links to M340 and M580 firmware files are provided via SESU pdf download.
This is a more comprehensive package of links (Firmware link spreadsheet V3.8)
New update as at 2019-08-15
The attached spreadsheet lists collated links to publicly available firmware for M340/ M580/ X80/ Connexium.
Updated with recent changes: - M340 V3.10 - Connexium config software - ReadMe files and minor fixes
Feedback welcome (broken links, improvements or additions needed).