steps
what you'll need: Same MIX 2.x firmware family. USB-A to Micro-USB + Windows PC (DFUSec), or myMIX app Bluetooth OTA.
1Same procedure as DMG Maxi / MAXI MIX. Download MIX-CT-FLASHING-BANKS-V2.1.3.zip from https://us.rosco.com/sites/default/files/content/resource/2023-03/MIX-CT-FLASHING-BANKS-V2.1.3.zip
2Install driver via lct_installer_1.exe if first time on this PC.
3Launch DFUSec.exe, go to File > untick 'Lock LINK2 function'.
4Connect MINI MIX controller via Micro-USB, power off first.
5Enter update mode: hold red dimmer button, power on, release dimmer but hold ON/OFF.
6Click Start in DFUSec; wait for both steps to complete in the log.
7Power cycle and verify firmware version.
GotchaMINI MIX is the earlier name for the DMG MINI fixture, same MIX firmware train. GotchaCRMX2 chip upgrade available separately (see MAXI entry) for MINI/SL1 Drivers with LumenRadio chip. GotchamyMIX app (iOS/Android) Bluetooth OTA is an alternative if Windows PC is not available.