I removed the following files to free up a bit of NAND flash space:
flash0:\vsh\nodule\update_plugin.prx
flash0:\vsh\resource\update_plugin.rco
These files control the Network Update plugin in the XMB, removal of these removes the functionality but the icon will remain. If you have 3.10 OE-A, you can access flash0 via the recovery menu.
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