GT-I9515- Unlock Done Successfully

[imeichecker.in]

Hi Guys,

First of all i'm new to samsung unlock unlock with cert and qcn and do require your help in simple language and easy to understand

I read the cert and qcn post from past two days and managed to unlock
GT-I9515 successfully without any glitch.

Simple and basic steps
1- GT-I9515 with 4.4.2
2- Root the phone with CF-Auto Root or King root.
3-Connect the phone along with z3x in PC
4- Back up QCN
5- Wipe EFS
6- Write CERT- GT-i9515 - Download - 4shared

Z3x carried on with result, phone rebooted and i was able to make call and everything.

Now I have two doubts if some can help me.

I know i have lost my original IMEI so is there any way I can get back my orignal IMEI.

And If writing CERT helps us to get network , then what does writing QCN helps us.

And one last thing
I have G901F and know its new qualcom processor so we can unlock it rite now with writing cert. Am I right?

Thank you so much in advance.