I'm sorry you didn't receive a response yet. Cisco shuts down between Christmas and New Year's which probably contributed to your question being missed.
I believe that if the URL for the file (in the BMP PIcture Download URL field) is not changed, then the phone won't re-download the file because it thinks nothing is changed (for example, if you updated the graphic but kept the old filename). I would try the following:
Change the filename of the graphic. Then, go into the phone GUI and change the BMP Picture Download URL to reflect the new filename. (Click the Phone tab and under General, make sure the BMP Picture Download URL reflects the correct url and new filename.) For example, "tftp://server.domain.com/pictures/newfile.bmp" Then click Submit All Changes and see if the phone grabs the new file from the server.
If that doesn't work, try temporarily changing to the default background picture (Phone > General > Select Background Picture > Default), then Save. Then after the phone pulls the standard image, go back in and change it back to the custom graphic.
Hopefully one of these suggestions will work. If not, please update and I will forward to someone in Engineering for additional help.
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