MixPre Firmware Installation Instructions
1. From the zip archive, extract the file within named MixPre_ #.##.prg file. Copy this .prg file to the root level (not within a folder) of an SD memory card that has already been formatted by the MixPre recorder.

2. Power the MixPre via:
USB-C on the Mixpre-3, -3M, or -3 II 
USB-C on the MixPre-6, -6M, or -6 II
When powering via USB-C from a computer, it is best to set Menu>System>USB-C to Power Only.
Use the included Hirose power supply for the MixPre-10T, -10M, or -10 II. 
Fully charged batteries are also acceptable on all models. 
Do not perform the update with low batteries or unstable power sources.

3. Insert the SD card with the .prg file.

4. Power on the MixPre.

5. Navigate to Menu > System > Update Firmware and follow the on-screen instructions.

6. When the update is complete the recorder will power cycle itself. The version number MixPre_ #.## will be displayed briefly on the splash screen while booting up. A message box appears “Firmware updated successfully Version: MixPre_ #.##”. Tap “OK”. Please note any changes or additions to the main Menu (if applicable). Consult product documentation for details.
7. When upgrading to firmware version 7.0 or higher from any version lower than 6.0 the firmware installation process will need to be completed twice. After the first installation is complete, the MixPre II will prompt you to start the second installation process.