Updating OS on bold using VMWARE Fusion

I have a problem and I am hoping that someone here may be able to help with a solution. I have a rogers bold, and I am trying to upgrade the OS to 5.x.x.x on it, and I have gotten an error 507 a few times. Now I know this is not unusual, but my problem is that if I try to update to .464 (bell mobility) or the latest Wind Hellas version (.507?? I think), it will stop and fail right after the it reboots, but when I try to use the rogers OS, it loads no problem. I have deleted the vendor.xml, wiped the blackberry, and tried everything I have read (battery pull, suspending the virtual machine until I get the 507 error) many, many times, to no avail. Has anyone else had an issue with upgrading a certain version, or maybe problems using fusion? Like I said before, I have used fusion many times to upgrade the OS on it, and nothing has changed recently. I can still load the 4.6.x.x version rogers has, but no other ones. Any suggestions?