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I've literally tried for hours trying to tftp the Mobility-Express AIR-AP1850-K9-8.1.122.0 to a brand new Aironet AP-1852i-B using the procedure found at:
https://supportforums.cisco.com/discussion/12677751/cisco-ap-1852-unable-convert-new-lightweigh...
I have resolved this.
This command does not work:ap-type mobility-express tftp://10.10.0.201/ap1g4
This command does work:archive download-sw /reload tftp://10.10.0.201/ap1g4