WARNING!!! This method requires phone to be rooted.
Before you start to flash custom recovery, download file from below:
After you download twrp , rename it to recovery.img & put it on root of sdcard.
Then Install Mobileuncle MTK Tools.
Enter into MobileUncle Tools and Click on “Recovery update“.there you will find recovery.img on the top, select it. Press OK it will reboot your device into your required recovery.
If you want to enter recovery from power off do this: