NO, with QPST 2.7.429.msi, that you already have it in the qfilx800hardbrickfix archive file.
i've tried to verify imei.
it's not 0..
012345678901234
012345678901235
it's the same of imei 0??
i am not sure to understood how restore imei

sorry
so i have some questions:
1 Must phone be in what mode? qfil? fastboot? or usb debugging mode?
2 how can i do a qcn backup?
3 must phone be rooted?
thanks
EDIT:
I resolved!
i have flash cuoco92 rom with SU, then i've run command prompt and write this command:
adb shell
su (accept on phone dialog window)
setprop sys.usb.config diag,adb
so i qualcomm diagnostic mode is aivable.
then i run qfil, tools, QCN backup restore, browse to make a qcn backup, then i restore file qcn you have attached. when finish i ve resetted manually phone and imei was Fixed. thanks a lot