No GSM signal after wireless update

Hi,

My phone is a THL4000 with KitKat 4.4.2, MTK6582KK

I recently updated my phone through "Wireless Update" found in the System menu and since then I have either low signal or no signal at all (depending on location). For example, at my workplace there isn't much signal strength by originally but my phone was available at 3/5 signal strength marks. Now I have Zero signal = No network at all, nobody can call me all day long. My phone is automatically searching for signal in every 5...

No GSM signal after wireless update

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