I would like to try the OS 4.5 update for the 8820 but have a question. I know you have to delete the XML file from the RIM folder. My RIM folder has 3 XML files in it... one labeled "Device" which is 15 KB, the other labeled "Vendor" is 1 KB and the third "Device Backup" is also 15 KB. Which one(s) of the three do I delete or rename before upgrading?