I have a T mobile (UK) Vario II and this method worked as user described.
I would like to add to some more detail to stage 5, the main upgrade program "MaUpgradeUt_noID.exe"
for the nervous out there (like me!)
During my upgrade the program "MaUpgradeUt_noID.exe" running on my actual PC Error'd
with an Update Error 114 and then exited, as he said it would, However, the PPC was left in
BootLoader stage with a message saying "Upgrade......Wait"
Still Soft-Reset the PPC dont wait any longer as it tells you on screen, allow the PPC to fully boot and confirm that all is OK, post upgrade.
Then Power Off device, replace your SIM for one from a different provider and Soft-Reset.
PINT on its way to developer......and many thanks!
BenPye - good additional instructions - worked for my SPV M3100
And pint on the way to the developer from here!