They in fact *must* be the same version for interoperability. 

Sent from my iPhone

> On Jul 16, 2020, at 10:59 AM, Pavlos Basaras <[email protected]> wrote:
> 
> 
> Hello again,
> 
> i updated the version of the host's uhd to  UHD_3.15.0.HEAD-0-gaea0e2de and 
> re-executed "sudo uhd_images_downloader -t mender -t n3xx --yes" .
> It solved the problem. 
> 
> One more thing is that after the update on the SD card file system, the uhd 
> version of the usrp also got automatically updated to the uhd version in the 
> host.
> Its safe to assume that both the host and the USRP are fine with the same uhd 
> version, correct?
> 
> all the best,
> Pavlos.
> 
> 
> 
>> On Thu, Jul 16, 2020 at 8:57 AM Pavlos Basaras <[email protected]> wrote:
>> Hello,
>> 
>> in case it would help i am also attaching the dmesg output from the usrp.
>> 
>> best,
>> Pavlos.
>> 
>> 
>>> On Wed, Jul 15, 2020 at 5:14 PM Pavlos Basaras <[email protected]> wrote:
>>> Hello,
>>> 
>>> that would be great!
>>> 
>>> cheers,
>>> Pavlos.
>>> 
>>>> On Wed, Jul 15, 2020 at 5:07 PM Marcus D. Leech <[email protected]> 
>>>> wrote:
>>>> On 07/15/2020 10:02 AM, Pavlos Basaras wrote:
>>>> > Hello,
>>>> >
>>>> > thank you very much for your prompt reply.
>>>> >
>>>> > i copied the .mender file by using the "scp" command.
>>>> > Yes, i am running the command on the USRP.
>>>> >
>>>> > I am not sure if this is a problem but --initially when i created the 
>>>> > .mender file, the host was running the UHD 3.14.0.0 and the USRP had 
>>>> > 3.14.1.0. This is when the problem appeared first.
>>>> > Then i changed the uhd to 3.14.1.0 on the host to match exactly the 
>>>> > UHD on the usrp, but the error still persists (or course i deleted the 
>>>> > old file from the usrp).
>>>> >
>>>> > any ideas?
>>>> >
>>>> > best,
>>>> > P.
>>>> >
>>>> I'll have to bug some R&D people and get back to you.
>>>> 
>>>> 
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