Image check failed when upgrading to 24.10 stable

As @slh says above, there are extra steps involved for RT3200.

  1. If you have not already updated to installer 1.1.3 installer, then
  2. Belkin RT3200/Linksys E8450 WiFi AX discussion - #6214 by el_charlie

But as for your error, you have obviously converted the device to UBI:

But then you grabbed the incorrect, non-UBI image from FS:

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