E8450/RT3200 gigabit speeds tweaking?

That is right.
And as discussed with @daniel two days ago, it is pretty difficult to modify the OpenWrt build system to produce also the UBI installer, so likely it will stay as a separate "un-official" item even after the 22.0x release, even if the UBI sysupgrade release images are "official".

But yeah, the situation is pretty bizarre: the UBI variant makes sense and is the preferred variant for the popular RT3200/E8450, but its installer can't easily be built as an official release item.

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