1.The WIFI card is inserted in the USG5120 products, use normal, the board did not fault.
2. DO cold-swap boards in 1,2 slot respectively, display same phenomenon, query related consulting, the use of the 2 slots is correct.
3 View the device platform
The device platform is "FWG1MPUA", that is the USG2200 old platform. The USG2200 device of this type do not support this WIFI card.
4.Connect an AP, the problem is solved.