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AJW3208's avatar
AJW3208
Aspirant
Mar 29, 2026

orbi rbr860 firmware 7.2.8.5 img file is missing from Dec 2025 security release update file

I am running a 3 node orbi system. (rtr + 2 x satellites). The solution is running 7.2.8.2_5.1.18.

 

I am actually struggling with domain.local issues, but in looking for a fix, I noted a security release for orbi rbr860 so I downloaded it from the support site.

 

Having unzipped it, I noted there were only 2 files in the zip, which I thought was odd. (release notes and .chk file). I tried uploading the .chk file to the satellites to see what would happen and it failed as I expected. The error msg returned was "file not found  (*.img)", so I assume its looking for an img file, which is not in the file from the netgear download centre. 

 

Where do I get a complete version of the update and also, why does Orbi firmware auto update not update to this new security release version?

 

Thanks

 

-Anthony

rbk860

5 Replies

  • plemans's avatar
    plemans
    Guru - Experienced User
    Mar 30, 2026

    did you extract it prior to trying to upload it? 

  • StephenB's avatar
    StephenB
    Guru - Experienced User
    Mar 30, 2026
    AJW3208 wrote:

    Having unzipped it, I noted there were only 2 files in the zip, which I thought was odd. (release notes and .chk file).

    Not unusual - if you download the older 7.2.8.2 firmware, you'll also only see release notes and a .chk file.

     

    AJW3208 wrote:

    I tried uploading the .chk file to the satellites

    The satellite firmware is not the same as the router firmware - you need to download that from here:

    You do need to extract the .chk file from the zip before uploading.

     

    You could of course also use the check-for-updates feature in the web ui.

    • StephenB's avatar
      StephenB
      Guru - Experienced User
      Mar 30, 2026
      FURRYe38 wrote:

      The RBR860 FW file is present with in the .zip file for the RBR860:

      Yes of course - and that has a .chk file extension - not the .img file extension that AJW3208​ was expecting.

       

      Looking at the thread, I believe the error message was the result of trying to install the RBR (router) firmware on the RBS (satellites).