Which of the following are the correct cutover steps?

A network needs to replace the dual-system hot-standby USG_A and USG_B due to the network upgrade of the new hardware USG. On the premise of not affecting the business, how to upgrade:

USG_A is the Active device, and USG_B is the Standby device.

Which of the following are the correct cutover steps?

① Connect the 5th line to the new USG_B in sequence.

② Connect lines 1, 2, and 3 from the old USG_A to the new USG A in turn,

③ Power on the new USG_B and the new USG_A, and import the configuration.

④ Enter undo hrp enable in USG_B, and cut off lines 4, 5, and 3 in turn.

⑤ Adjust the routing cost so that all traffic passes through USB_B.

⑥ Enter hrp enable for the new USG_A and new USG_B, and adjust the routing cost to meet the expectations.