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My password apparently had some disallowed special characters in it. The Linksys UI will allow you to set such a password, but the firmware flash will fail.
I reset the password to "admin" and was able to flash OpenWRT!
Thanks for the response! Just to give you some background, I bought this router (used) at a thrift store for the sole purpose of installing and playing with Openwrt...
The firmware version is 1.0.5.182871. I justrecently upgraded from 1.0.4.x in the hope that the upgrade might help. Apparently not!
Anyways, the other post where a forum member changed their password to one without special characters seems worth a try, as mine does have special characters in it! I'll give it a try and report back soon...