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How To Write MTK IMEI  625A Cpu To AT Mode Working Fine 

step by step try this solved your phone imei problem 

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Turn On The Phone

Connect To PC Using USB Cable

Now Select PC Suite / COM

Install Driver

Open Volcano Latest Soft

Go To MTK Tab

Enable Imei Option

Select Write IMEI

Unmark Auto Detect Pinout

Mark USB Mode

Now Click To Run

Select Phone Port ( COM PORT )

Select AT If Already Not Selected

Entry IMEI

Click To ""Write IMEI(W)""

Wait Until Done

working my all volcano user and enjoy this volcano box all user.