If you have your (working) orig. Fubu you haven't to be "scared"!
One reason,that your upgrade doesn't work, could be your chipset...BA20 Chip is a little bit more difficult as CE20, C289 or C489 Chip.
Use this link and download SME45Tools:
http://gsmfree.vipserver.ru/Siemens/sme45_sme45i.htm
There is also a manual, how to update SME45 to SME45i (but only in german!)
In your case...select register "Write flash"..."Read from file" (here you must select your orig. Fubu)..."Write to flash" (short pression red button) - READY!
Now your orig. Fubu will be restored.
It works 100%.
Please search forum, too. There are "hundreds" of posts about this topic...
Example:
http://forum.gsmhosting.com/vbb/show...ghlight=sme45i
BTW: (Hope you use an non-original-datacable)!!! Have you charged your battery to max. before you made your fubu? So before restore your fubu, you have to charge your battery to max. again!
BR
genetic1