microHAM MK2R firmware `v3.0`

microHAM · Released Nov 22, 2007 · First seen Sep 9, 2026

v3.0 is not the latest firmware for the microHAM MK2R: the current version is v7.19 (October 8, 2020). Go to v7.19

In short — summary by updatemystuff.com

Keyer now follows focused radio's TX mode, band lock logic revised, BackSpace on PS2 acts as ESC.

Keyer protocol and settings format updated for router compatibility (EEPROM reset required)
Keyer mode follows TX mode of focused radio
BackSpace on PS2 keyboard functions as ESC

Written from microHAM's release notes, which are printed in full below.

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Some changes in keyer protocol and settings format was introduced to be compatible with router v5.1.0. Hence firmware MUST be upgraded and power-up settings MUST be again stored to EEPROM of keyer.
Firmware utilizes extended frequency/mode information from router CAT decoder:
Keyer mode follows TX mode of focused radio.
Band lock is active when TX band of focused radio equals to RX band of the second radio.
bug fixed: Winkey lead time was derived from settings of TX foxused radio instead of settings of WinKey focused radio. It can differ when "Reverse WinKey Focus" mode is selected.
BackSpace on PS2 keyboard now functions as ESC.

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