The Cassini 16 Infrastructure's Testhead uses a stack of three PCBs as the RIFL Hub (RIFL main board) to distribute power and control to the Front and Rear RIFL top boards and the four RIFL II "H-location" ports used for controlling AUX instruments and handler/prober. After replacing this assembly, a "Serial Number Not Stored in tester..." prompt may appear after launching Cassini. Follow the procedure below to copy the Guru ID from the current running EPC to the newly installed hardware. This allows the Guru ID to be restored from when the EPC is swapped in the future.

1. Start Cassini with a User App or Short Cut that includes Patch 241 and Guru v72+.
2. If the Serial Number stored in the RIFL Hubs do not match the Guru ID of the EPC, the system will present a prompt with "Serial Number Not Stored in tester, ..." message.
3. Press Ok and continue to the next step. (See Figure 1)
4. After the Cassini app finishes loading, type "RiEquipmentPool changeTesterSn" into the white area below the System button.
5. Select the text by clicking to the left of "Ri.." and dragging to the right of "Sn"
6. Choose DoIt from the right mouse button menu.
7. Choose Yes when prompted to update. This will update the Root Hub's Guru ID with the currently running Guru ID.
8. Now Close the Cassini application and re-launch the Short Cut to confirm that the message is not presented and all the TIMs and RIFL ports are now working by following the Diagnose Proceedure.