I tried as recommended above. I tried a lot of things - including 4 different found versions of 5.7.4. The 4th one worked. If you're breaking an Oasis, the one that works is on MediaFire:
http://www.mediafire.com/file/xoxsmd....4_initial.bin
The versions on Amazon, Softpedia, and (can't remember now..) don't work with an Oasis - even though they claim they do.
Thanks for the help!