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You need to install a new image on your USRP via mender or manually. I had to 
do this recently to fix the same issue. See "updating filesystems with mender" 
in the docs.

Ryan
________________________________
From: Steve Hamn <stevehamn...@gmail.com>
Sent: Thursday, February 15, 2024 3:20 AM
To: Marcus D. Leech <patchvonbr...@gmail.com>
Cc: usrp-users@lists.ettus.com <usrp-users@lists.ettus.com>
Subject: EXTERNAL: [USRP-users] Re: GNURadio MPM major compat number mismatch 
after update to UHD 4.6

Yeah, that is what I figured. Any suggestions on what to do? I tried 
uninstalling and reinstalling gnuradio as well as installing UHD4.6 on my host 
PC. I'll ask the gnu-radio mailing list too.

Thanks,

Steve

On Wed, Feb 14, 2024 at 5:07 PM Marcus D. Leech 
<patchvonbr...@gmail.com<mailto:patchvonbr...@gmail.com>> wrote:
On 15/02/2024 04:03, Steve Hamn wrote:
Hello,

I updated my N320 to UHD 4.6, however now I am getting an error in GNURadio:

"RuntimeError: RuntimeError: MPM major compat number mismatch. Expected: 4.2 
Actual: 5.3. Please update the version of MPM on your USRP device."

Any suggestions on how to fix?

Thanks,

Steve



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Your Gnu Radio install probably is linked against an older version of UHD, 
hence the mis-match.


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