Oneplus X IMEI repair not done.

I have a Oneplus X.
I want to change the IMEI.
I read the QCN through QPST then Edited the IMEI through HEX editor and restored it back.
But the IMEI doesn’t change,it stays what it was before.
I tried erasing the ModemST1 and ModemST2 partition through fastboot and restored the QCN before i had downloaded,But it doesn’t stick.

DO I have to erase the FSG partion too?
Or there is something that I am missing?
Any help appreciated.