In case of problems with automatic update, download please the newest firmware and install it from file.
Update to the version VT 2.66.8 with device cleaning
Devices XTi 34XX
Update to the version VJ2.66 with device cleaning
Devices XTi 33XX
Update to version VB 2.59 (for devices XTi 33XX)
For switchover from version 2.47, update to the version 2.48 first of all.