G920R4 Cant Write Cert

[chupacabra8686]

The phone came to me with android 7.
I can downgrade it to the operating system before it, android 6, but the problem is the same.

When i try to write cert:

Operation: Write CERT
Selected model: SM-G920R4
Selected port: COM271 SAMSUNG Mobile USB Serial Port
Software version: 29.0

Checking CERT file... OK
KEY ID: 0053
Waiting ADB device... OK
Reading phone info...
Model: SM-G920R4
Android version: 6.0.1
Product code: Not Active
Phone version: G920R4TYS4CPL1
PDA version: G920R4TYS4CPL1
CSC version: G920R4USC4CPL1
CSC country code: USA
CSC sales code: USC
HW version: G920R4.02
Phone SN:
Modem board: MDM9635M
Security patch: 2016-12-01
RF cal date: 2015.10.23
IMEI:
Writing AT RIL... OK
Initialization AT RIL... root required
Checking Super user right... true
Initialization AT RIL... OK
Bypass MSL... error (2)
First reset MSL
Done with Samsung Tool PRO v.29.0




When i try to reset msl:

Operation: Reset MSL
Selected model: SM-G920R4
Selected port: COM271 SAMSUNG Mobile USB Serial Port
Software version: 29.0

Reading phone info...
Reading IMEI... OK
IMEI: 990005848635034
Reseting MSL security... error (0)
Done with Samsung Tool PRO v.29.0


I tried downgrading the modem, which it will let me do, but it still does not want to allow me to reset the msl.

Any way that i can write cert to this phone or am i out of luck?

[chupacabra8686]

Follow up:

I flashed this:

COMBINATION_USC_FA50_G920R4TYU4APK1_USC4APK1_CL499 2770_QB11463896_REV02_user_mid_noship.tar

It lets me write the cert, but the phone now has an MEID of
99000584863503 (that is not the imei of the cert, nor the original)

When i flash back to stock firmware, the MEID stays like this,
but the IMEI shows the original imei of the phone.

In *#0011* it shows IMEI CERTI: FAIL, -9

I still cant reset the MSL or reset the EFS. It throws off errors.

The cert files use the same key as this model, so it should not be a big problem.

Any ideas on how I can manually reset fix this? Perhaps manually reset the efs?

Is there anything z3x can do to help? I can install teamviewer if necessary.

[zzaheerr]

flash back to stock firmware
rest efs

need BST dongle for rest efs

and will back with orgnal imei

[chupacabra8686]

Not too keen on spending a bunch of money to fix one problem. Would be cheaper to replace the motherboard. Is it for certain the BST works on the newest firmwares for the s6?

Also, still hoping Z3X team can help me fix/repair the EFS for this phone.

When i write the QCN backup i made it says restoring EFS but it doesnt touch it.

[chupacabra8686]

Managed to reset the EFS, but now the IMEI is B0000000
IMEI CERTI: FAIL, -3

When i write cert, it changes only the IMEI CERTI: FAIL, -7

The IMEI stays the same though. B0000000

Any help you can provide Z3X??