S9 Modem Downgrade for Cert Read and Write. - GSM-Forum

bu44er · 08-29-2019, 16:18

Hello everyone.

I was wondering if anyone could help me.

I am trying to read a cert from a working S9. When I run "Read Cert" I get an error stating that "modem not supported" and "Try downgrade modem if possible".

Is it possible to downgrade S9 Modem and if so what file should I use?

IMEI_info · 08-30-2019, 08:17

Yes is possible but need ROOT phone that means bypass Knox security that mean no warranty for phone.
But in your case that you only want to read cert I will write to phone combination firmware and then read cert from it.

bu44er · 08-31-2019, 09:51

I have flashed U6 combination firmware, procedure completed successfully.

Unfortunately I am unable to read the cert from the phone due to Z3X giving me a "Combination firmware detected, please flash user firmware." error.

Does anyone know a way around this? I'd just like to read the cert from one phone and write it to another one.

08-29-2019, 16:18	#1 (permalink)
bu44er Junior Member Join Date: Jan 2013 Posts: 5 Member: 1862667 Status: Offline Thanks Meter: 0	S9 Modem Downgrade for Cert Read and Write. Hello everyone. I was wondering if anyone could help me. I am trying to read a cert from a working S9. When I run "Read Cert" I get an error stating that "modem not supported" and "Try downgrade modem if possible". Is it possible to downgrade S9 Modem and if so what file should I use?

08-31-2019, 09:51	#3 (permalink)
bu44er Junior Member Join Date: Jan 2013 Posts: 5 Member: 1862667 Status: Offline Thanks Meter: 0	Update! I have flashed U6 combination firmware, procedure completed successfully. Unfortunately I am unable to read the cert from the phone due to Z3X giving me a "Combination firmware detected, please flash user firmware." error. Does anyone know a way around this? I'd just like to read the cert from one phone and write it to another one.

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08-30-2019, 08:17	#2 (permalink)
IMEI_info No Life Poster Join Date: Oct 2017 Location: on google.com Posts: 2,081 Member: 2771307 Status: Offline Thanks Meter: 772	Yes is possible but need ROOT phone that means bypass Knox security that mean no warranty for phone. But in your case that you only want to read cert I will write to phone combination firmware and then read cert from it.