Because you need to tweak and tweak maybe if you successfully get an imei, someone faster might have used it immediately
The popular way to get imei is usually via imei analyzer.
One disadvantage about this analyzer is that once you tweak an imei, if it is wrong, it won't show you an alternative example.
Seconded by a valid imei.
•Featured on Lordxdonval.com.ng
This is the best method to automatically get a valid imei instantly.
Visit this site
Or copy the URL and paste on your browser
Type the imei you wish to tweak
Then change the last 3 digits (depending)
Click on validate.
It would indicate whether it is correct or not.
If it is not correct it would show you a valid one.
So you need to rush and tweak using Mtk engineering or any other app.
If someone has also used that one you need to follow the procedures again.
I hope this helps.