とりあえずのメモ（Thanks id:chai99師）

Important: on the phone uninstall any DUN hack (eg. WM6_BT_DUN.cab)
On the Universal, install the Bluetooth Broadcom Stack (UNIBT.CAB) (in the device's memory, not on the storage card)
Disable Bluetooth from the connectionmanager (this is the old stack)
Enable bluetooth from Settings - Connections - Bluetooth (this is the new stack, this doesn't work from the connection manager anymore)
Disable all other connections (WiFi, phone)
Start Programs - Bluetooth Manager
On the phone, start Internet sharing (make sure the phone is discoverable)
On the Universal, in the Bluetooth Manager, create a new shortcut
Choose Explore a Bluetooth Device
Select the phone and choose Network Access Point
Now tap and hold the newly created icon and select Connect
Enter a passkey on both the Universal and the phone
On the phone I selected serial port as service but I don't think it is really necessary
Important: on the Universal tap and hold the antenna icon and. In the balloon that appears, select The Internet and choose Connect