I also had a problem with firmware loads. On the recommendation of one of the list members, I switched from the KUSB (yes, I have the new version) to a TrippLite Keyspan USB-Serial adapter, and my firmware load problem went away. Some consumer-grade USB-Serial adapter chips can be unreliable. In my work, I'm familiar with commercial-grade adapters like MOXA NPort, which are more reliable and more expensive. Of course, YMMV.
> From: David Kent <[hidden email]>
>To: "elecraft, list" <[hidden email]>
>Sent: Wednesday, December 21, 2011 6:53 PM
>Subject: [Elecraft] K3 - Error loading DSP1 firmware
>I am using K3 Utility version 18.104.22.168 and KUSB adapter. The K3 is serial
>#5253. I get the following message in the K3 Utility:
>*DSP1 firmware load failed
>Error Code xE2000046
>Version number verification failed*
>The K3 is showing
>MCU and FPF were successfully loaded. Please help.
>Elecraft mailing list
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