4404 WLC stuck in boot loop after upgrade

In prepping for the upgrade to 4.1.185.0 I've got two controllers at different sites stuck in a boot loop after applying 4.0.219.0. Units will not even get to the <ESC> option menu.
ANy ideas?

Did you clear the configuration on the controller by using Option 5 in the boot menu? This will corrupt the boot image. You should not choose the clear config (option 5) from the boot menu on controllers running 3.2.78.0, 3.2.116.21, 3.2.150.6 or 3.2.150.10, 3.2.171.5 or 3.2.171.6, 4.0.155.5 or 4.0.179.8 and 4.0.179.11.

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