Motorla Defy+ being not possible to root. Script commands throwing errors when rooting android 2.3.6
I solved!
I flashed a hacked chinese sbf. This sbf let me use z4root.apk to get root access.
Sorry about don't put the file name, that's because it does not have a meaningful name, it's just firmware.zip, I found it in xda-developers forum.

Be careful using the files above, you can easily brick you cell phone.

The Chinese hacked firmware is this: Firmware Part 1 and Firmware Part 2.

The application who enables rooting is this z4Root.apk.

*Sorry, I don't know how much time the links will be available.