Bryan,

There is no change log for K2 firmware. Some upgrades were made to support hardware and option additions. The last MCU version 2.04R locked the sidetone source at U8-4 to reduce the number of support calls saying "My K2 lost its sidetone", and did nothing else over and above version 2.04P. If you have a K2 below SN 3000, you must do the sidetone source wiring mod unless that has already been done with the installation of the KIO2 or KPA100.

Upgrading the MCU also requires upgrading the KIOC (RF board U1), but the firmware for the options can be upgraded separately.

73,
Don W3FPR

On 8/3/2020 6:33 PM, Bryan Nehl wrote:
I'm trying to locate the change log or release notes for the various K2 
firmware.
For example: what feature/improvements are in version X of the (ATU/IO/MCU) 
firmware?
Is all the firmware stand alone, or should certain versions be upgraded at the 
same time or not mixed?

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