I replaced the K3 USB-Serial adapter with a TrippLite Keyspan USA19-HS USB-serial adapter. The MCU firmware loaded the first time. I haven't taken the time to troubleshoot the problem, so it would be inappropriate to speculate what the root cause was. YMMV.
73 Don NA6Z
K3# 5495
>________________________________
>From: Don Putnick <
[hidden email]>
>To: Elecraft Mailing List <
[hidden email]>
>Sent: Saturday, September 10, 2011 10:07 AM
>Subject: MCU load failure; K3 not responding error message
>
>My factory-built K3 came with firmware version MCU 4.36 / DSP 2.73, 4-20-2011. I'm using the latest Mac version of the K3 Utility, MAC OS X Version 1.4.1.8 March 11, 2011. I've been able to save configurations, configure filters, and restore configurations with no problems.
>I just tried to update my firmware for the first time to the latest production version MCU 4.39 / DSP 2.73, July 6, 2011. The MCU firmware failed to load, so I tried to force a download per the manual. At that point I got the "K3 is not responding" error message. I did a factory reset, and was able to reload my latest configuration. I repeated the firmware update, with the same errors. I've also tried reinstalling the K3 Utility and downloading the firmware again. No ceegar.
>I'd appreciate any suggestions. Thanks much.
>Don Putnick, NA6Z
>K3# 5495
>
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