this model hard reset not sported flash it this tool 
  Quote:
    
Package Included:
 
 Firmware V3_22.02.2013
 
Download Tool
 
Phone Driver
 
How to Flash
 
IMEI Writing Tool    
How To Flash micromax ninja a27 
 
Run driver file 'DPInst.exe', Normal USB data cable-3 for flashing,  Select Pac file,press play/start on tool, press Volume down key on  phone(with battery>50%),Connect the cable,installation of drivers  takes place automatically. Then software auto start,
 
For IMEI : Open IMEI tool, connect phone with USB & switch ON, check  'DIAG'COM PORT in device manager,Select COM in tool,Write IMEI on tool,  press write,IMEI will successfully written.