I would first double check and make sure that all TFTP files have been uploaded correctly and have the TFTP service restarted. It looks as if all the phones use the same size of files so you may need to verify what phone firmware you're running. I would upgrade any phone firmware and retest downloading that background images.
cannot change background image of 8945,8961,9951 and 9971
The version of firmware you're running is unsupported with any versions of CME at this time. What version of IOS is running on the 29XX series router? You need to verify what version of CME you're running and make sure you're running the correct version of firmware for the phones.
It looks like you'll need to downgrade that firmware and re-test.
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