To analyze an Imei is not a difficult thing but you analyze imei or serial number because you are trying to get the real imei of a specific phone or device. So i am going to teach you the full way of how to analyze imei number.
How to analyze Imei or serial number
Download Imei Analyzer From Playstore
Then open it and put the full imei you want to analyze in the space provided in the Imei Analyzer then delete 3 digits from the end of the imei and replace 2digits more from your mind and then click ANALYZE. So if is correct you will see it in the screen but if is not you will have to replace valid digits.
So if you have gotten the valid Imei just copy to your MTK ENGINEERING and tweak.
So I hope is helpful?