try with this procedure imei tab hide..
and with meta mode imei repair error
Code:
Download special files:
Download special MTK addon from boot-loader.com (Sigma free section) and put it into My Documents\SigmaKey\addons\< your Sigma card number > folder.
Settings:
Select "MTK" platform from the tab menu in the upper left side of the software
Go to "IMEI" tab
Select "USB (autodetect)" in the serial ports selection tab
Select your phone model in the "MTK boot" drop-down menu
Enter IMEI number in the "Phone IMEI" field
Press "IMEI REPAIR" button
and with meta mode imei repair error