[OE-core] How do I change the "Architecture" of a package?

[Mike Looijmans]

What if the architecture of a package was accidentally left at its 
default, but it should have been "all" for example?

Just putting "inherit allarch" or simply PACKAGE_ARCH="all" into the 
recipe is not enough. You get stuck with a "more specific" older 
version, so that no device wants to upgrade to the newer version that's 
"all" architecture compatible.

Only way to fix this was to manually remove the old version from the 
feeds and also manually remove it from the device, and then reinstall 
it. This works for me personally, but what if I want to apply this to 
about a million devices that are already in the field?

What can I do to get them to upgrade from the (in this case) "mipsel32" 
to "all" package?

(and I have a few dozen of these mis-architectured packages...)

-- 
Mike Looijmans