QRP Labs QMX firmware `v1_04_003`

QRP Labs · Released Jul 18, 2026 · First seen Sep 7, 2026

v1_04_003 is not the latest firmware for the QRP Labs QMX: the current version is v1_04_015 (September 24, 2026). Go to v1_04_015

What's in this update

CAT new command UI gets 24-character unique serial number of the STM32 chip
CAT new commands BU, BD for Band Up, Band Down
CAT new command BN get/set the band from/to the column number of the Band Config table
'E' symbol on no or insufficient digi mode audio is delayed 0.5 seconds to avoid concern
Bug fix: Errors with CAT MM commands for list values like EQ global gain
Bug fix: CAT MM for returning display delimiter didn't return it.
Bug fix: CAT MM issues with CW Center frequency due to pointing at wrong list
Bug fix: Error reporting and actions on Virtual U3S fixed
Bug fix: Output RF when Practice mode on and Semi QSK enabled
Bug fix: Stored message sending couldn't be stopped by a dit or dah press
Bug fix: Prevent GPS streaming to a port configured at not more than 9600 baud
Bug fix: 1pps Heart icon was not displayed correctly in U3S screens

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