Over the years I have updated the firmware on OBi100, OBi110, OBi200, OBi202 and OBi1032. It was never necessary to redo the **5 procedure.
Your OBi can still be used with other ITSPs by configuring via its onboard web server. azrobert has posted how to use it for GV in conjunction with a PC. Have you studied the DSL Reports forum posts to ascertain if the non-official firmware enables GV configuration without the Obitalk portal?