N920 Bootloader/Modem Downgrade - GSM-Forum

66nakyoz · 10-08-2016, 11:11

Dear All,
I urgently need help.
N920C with latest update (N920CXXU3BPIA_N920COXE3BPI2_N920CXXU3BPH4)
The modem has been patched before when it was on OJ5 and after that some idiot made the update through ODIN.
My problem now is:
Downgrade modem impossible cause bootloader is locked.
New modem not supported for patch.
TWRP installable, root OK.
What can I do to get the modem work again?
I am trying since 5 hours but no success.
Thx in advance

66nakyoz · 10-08-2016, 12:38

9283 try
Flashed combination firmware but???
Only reset FRP possible, nothing else.
Please help me.

CHANDARAKK · 10-09-2016, 00:57

what ur phone problem? please post log here we all can helop u out

66nakyoz · 10-09-2016, 06:38

Thx for your answer. N920C Note 5. Log irrelevant modem not supported by Z3X.
I need solution to downgrade modem to OJ5 or other patchable version.
Bootloader locks downgrade each time when I flash with older firmware as the firmware on the phone with sec patch 09/2016.

66nakyoz · 10-09-2016, 11:58

For all who have the same prob:
I managed to return the phone to the initial state.
The problem is as described the new bootloader that
blocks downgrades. Long before ee had the same probs with S4 phones
whose modem could not be repaired after imei write with box.
This time we have the possibility of using the combination firmware.
Flashing the firmware allows to repair imei (only repair no patch) so that after
writing the original imei to the phone and flashing again with the same firmware
on the phone the phone becomes alive again. (*#0011# gives answer OK)
Tried to do the same procedure with different imei but no network and status N/A.
PM me if you have further questions.

66nakyoz · 10-09-2016, 12:05

Procedure to write Orig IMEI to phones with changed/lost IMEI and Network Probs after update.

1. Flash combination firmware
2. Wipe cache and dalvik
3. Developer options-->Enable USB debug
4. Repair imei
5. Reboot (auto reboot does not work)
6. Flash 1:1 firmware before combi firmware
7. Wipe again
8. check IMEI status Ok *#0011#
9. Enjoy network again

CHANDARAKK · 10-09-2016, 13:11

Quote:

Originally Posted by 66nakyoz

Procedure to write Orig IMEI to phones with changed/lost IMEI and Network Probs after update.

1. Flash combination firmware
2. Wipe cache and dalvik
3. Developer options-->Enable USB debug
4. Repair imei
5. Reboot (auto reboot does not work)
6. Flash 1:1 firmware before combi firmware
7. Wipe again
8. check IMEI status Ok *#0011#
9. Enjoy network again

can u shared ur combinattion firmware?

anasshe · 10-23-2016, 02:52

Quote:

Originally Posted by 66nakyoz

Procedure to write Orig IMEI to phones with changed/lost IMEI and Network Probs after update.

1. Flash combination firmware
2. Wipe cache and dalvik
3. Developer options-->Enable USB debug
4. Repair imei
5. Reboot (auto reboot does not work)
6. Flash 1:1 firmware before combi firmware
7. Wipe again
8. check IMEI status Ok *#0011#
9. Enjoy network again

i think not working with new security

10-08-2016, 11:11	#1 (permalink)
66nakyoz Crazy Poster Join Date: Apr 2005 Age: 48 Posts: 54 Member: 136882 Status: Offline Thanks Meter: 16	N920 Bootloader/Modem Downgrade Dear All, I urgently need help. N920C with latest update (N920CXXU3BPIA_N920COXE3BPI2_N920CXXU3BPH4) The modem has been patched before when it was on OJ5 and after that some idiot made the update through ODIN. My problem now is: Downgrade modem impossible cause bootloader is locked. New modem not supported for patch. TWRP installable, root OK. What can I do to get the modem work again? I am trying since 5 hours but no success. Thx in advance

10-08-2016, 12:38	#2 (permalink)
66nakyoz Crazy Poster Join Date: Apr 2005 Age: 48 Posts: 54 Member: 136882 Status: Offline Thanks Meter: 16	9283 try Flashed combination firmware but??? Only reset FRP possible, nothing else. Please help me.

10-09-2016, 00:57	#3 (permalink)
CHANDARAKK No Life Poster Join Date: Dec 2008 Posts: 3,483 Member: 930280 Status: Offline Thanks Meter: 1,183	what ur phone problem? please post log here we all can helop u out

10-09-2016, 06:38	#4 (permalink)
66nakyoz Crazy Poster Join Date: Apr 2005 Age: 48 Posts: 54 Member: 136882 Status: Offline Thanks Meter: 16	Thx for your answer. N920C Note 5. Log irrelevant modem not supported by Z3X. I need solution to downgrade modem to OJ5 or other patchable version. Bootloader locks downgrade each time when I flash with older firmware as the firmware on the phone with sec patch 09/2016.

10-09-2016, 11:58	#5 (permalink)
66nakyoz Crazy Poster Join Date: Apr 2005 Age: 48 Posts: 54 Member: 136882 Status: Offline Thanks Meter: 16	For all who have the same prob: I managed to return the phone to the initial state. The problem is as described the new bootloader that blocks downgrades. Long before ee had the same probs with S4 phones whose modem could not be repaired after imei write with box. This time we have the possibility of using the combination firmware. Flashing the firmware allows to repair imei (only repair no patch) so that after writing the original imei to the phone and flashing again with the same firmware on the phone the phone becomes alive again. (*#0011# gives answer OK) Tried to do the same procedure with different imei but no network and status N/A. PM me if you have further questions.

10-09-2016, 12:05	#6 (permalink)
66nakyoz Crazy Poster Join Date: Apr 2005 Age: 48 Posts: 54 Member: 136882 Status: Offline Thanks Meter: 16	Procedure to write Orig IMEI to phones with changed/lost IMEI and Network Probs after update. 1. Flash combination firmware 2. Wipe cache and dalvik 3. Developer options-->Enable USB debug 4. Repair imei 5. Reboot (auto reboot does not work) 6. Flash 1:1 firmware before combi firmware 7. Wipe again 8. check IMEI status Ok *#0011# 9. Enjoy network again