Hi Brian, The error message tells surprisingly few details. Looks like there was something wrong with the RPC connection between the device and the host and it seems to fail very early in the communication process. But what I saw again in the log output now was this: [MPM.PeriphManager] [WARNING] Failed to initialize device on boot: RuntimeError: ARM Mailbox Busy. Command not executed in MYKONOS_sendArmCommand() That makes me fear we have some kind of hardware issue here. With this error we probably skip some portion of the init code in which objects would be created that we could access later, but which are now only None. I'd propose these next steps: Try a different device image (Mender), maybe UHD 4.5, or just reflash 4.6, and then test if the issue persists. If you take a different UHD version, just use UHD on the device directly, that saves you from changing your host for the test. If the issue persists, please reach out to the NI support.
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