Read the Owners Manual first!
Firmware
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Contents
Manual
User contributions
Firmware release notes
You'll find the firmware release notes here.
Update procedure
When using MIDI-over-USB the transfer speed can be increased significantly by setting "Milliseconds between buffers" to 20 ms and "Delay after F7" to 20 ms.
Using MIDI-OX
When using MIDI-OX (Windows) to send firmware to the Axe-Fx II, be aware that its default settings may cause a buffer overrun error. Change Low Level I/O Buffers size to 256, and number to 16, and Milliseconds between buffers to 90.
Updating presets after a firmware update
Updated firmware may cause changes in your presets. Read the firmware release notes and verify your presets.
Programming language
The firmware is coded in C and assemby. Source
