Download the two files from the link below to your USB-Testbook using the Firefox browser. You will then need to open the file manager and locate the files in the /home/testbook/Downloads directory.
Right click on the file repositoryRelocation and select properties and then change the permissions to allow file execution. Double click on the file and when the dialouge box comes up say run in terminal.
The script is now complete and your USB-Testbook will be pointing at the new Software Update Server.