Just found out by googling that the O2 X3 is actually a BenQ S700 in real life.

Have a look at

http://www.benq.com/Products/product.cfm?product=549

tried the handset manager on the download page but wont connect to the O2 X3 so there must be some slight differences.

If you look at the folder where the O2 X3 handset software is there are some files that do mention benq too.