Thats exactly the process I followed.. I have since done another test..
Again, I removed all "Device Software" from under Add/Remove Programs, and this time installed the previous version again (8700M_PBr4.5.0_rel75_PL188.8.131.52_A184.108.40.206_Orange_Romania)
Add/Remove programs shows it, but Desktop Manager does not give me the option to "upgrade"..
I will try a reboot now, but I can't imagine that it will work.. But you never know!