how to fix imei 0000, imei null, invalid imei, no imei, no sim, no service and unknown baseband vivo y66, y66L, y55 and other qualcomm for factory imei (865407010...09)

Now, we are going to provide all of you how to fix or repair imei null, imei 0000, invalid imei, no imei, no service, no sim, and unknown baseband vivo y55, y66, y66l and other QUALCOMM.

The first, download all tool and file qcn bellow:

1/ QCN Y66

2/ QPST_2.7.472.4

3 QualcommIMEIRebuilder

1/ Run QualcommIMEIRebuilder tool open choose qcn to rebuild new qcn for factory imei

2/ type *#558# and choose Quality verication test and tick Debugging Port click allow ADB.

3/ Run QPST_2.7.472.4 check Port choose on Tools choose QCNBackup and Restore Browse choose QCN new build and click on Restore QCN wait until finish. it OK.