Unhappy [q] huawei e5776 wlan off?

Dear All,

My E5776 with Germany latest RC1 Firmware, and it ran as in China Telecom 4G FDD LTE sim card, but its WLAN disappeared, I could not connect to 4G network through cable.

I uploaded 3 pictures, and you could see 1). in the first one, the WLAN status is off 2) . sometimes the WIFI Logo on the screen is gone; 3). Sometimes the WIFI logo on the screen is on.

I had set the WLAN autooff is Disabled. I do not know where is the WLAN switch to enable it? Anybody knew this issue? HELP!!
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Device:
iPhone 5s
iPad Mini with Retina Display
iPhone 4s
HUAWEI E5776