How to Cert Write on N910T 5.1.1 OK2 Without wiping EFS

This has been done before and other have shown logs its possible, trick is to downgrade modem. Reset msl and then reflash modem and write cert.

z3x works for this use the phone tab in flash

Flash NK4 modem

Reset MSL

Reboot to download

Flask DOK2 modem

Write cert

For unlock only

write nk4 modem

unlock

write DOK2 modem

Those who rooted flash recovery_cache from OK2 folder and msl reset will work fine, with no ril errors.

https://mega.nz/#F!54IkUQ7Q!7uqZJ9pqQqKOLDWNIqrrhQ

Operation: Reset MSL
[ 12/16/2015 11:24:00 PM ] Selected model: SM-N910T
[ 12/16/2015 11:24:00 PM ] Selected port: COM81 SAMSUNG Mobile USB Serial Port
[ 12/16/2015 11:24:00 PM ] Software version: 23.7
[ 12/16/2015 11:24:00 PM ]
[ 12/16/2015 11:24:00 PM ] Reading phone info…
[ 12/16/2015 11:24:00 PM ] Reading IMEI… OK
[ 12/16/2015 11:24:00 PM ] IMEI: 356095062611983
[ 12/16/2015 11:24:00 PM ] Reseting MSL security… OK
[ 12/16/2015 11:24:00 PM ] Reseting… OK
[ 12/16/2015 11:24:00 PM ] Reset MSL done
[ 12/16/2015 11:24:00 PM ]
[ 12/16/2015 11:24:00 PM ] Operation: Write CERT
[ 12/16/2015 11:24:00 PM ] Selected model: SM-N910T
[ 12/16/2015 11:24:00 PM ] Selected port: COM81 SAMSUNG Mobile USB Serial Port
[ 12/16/2015 11:24:00 PM ] Software version: 23.7
[ 12/16/2015 11:24:00 PM ]
[ 12/16/2015 11:24:00 PM ] Checking certificate file… OK
[ 12/16/2015 11:24:00 PM ] KEY ID: 0772
[ 12/16/2015 11:24:00 PM ] Waiting ADB device… OK
[ 12/16/2015 11:25:00 PM ] Reading phone info…
[ 12/16/2015 11:25:00 PM ] Model: SM-N910T
[ 12/16/2015 11:25:00 PM ] Android version: 5.1.1
[ 12/16/2015 11:25:00 PM ] Product code:
[ 12/16/2015 11:25:00 PM ] Phone version:
[ 12/16/2015 11:25:00 PM ] PDA version: N910TUVU2DOK2
[ 12/16/2015 11:25:00 PM ] CSC version:
[ 12/16/2015 11:25:00 PM ] CSC country code: USA
[ 12/16/2015 11:25:00 PM ] CSC sales code: TMB
[ 12/16/2015 11:25:00 PM ] HW version:
[ 12/16/2015 11:25:00 PM ] Phone S/N: RF8FA0R4KXK
[ 12/16/2015 11:25:00 PM ] Modem board:
[ 12/16/2015 11:25:00 PM ] RF cal date:
[ 12/16/2015 11:25:00 PM ] IMEI:
[ 12/16/2015 11:25:00 PM ] Initialization AT RIL… OK
[ 12/16/2015 11:25:00 PM ] Bypass MSL… OK
[ 12/16/2015 11:25:00 PM ] Checking for compatible phone and cert… OK
[ 12/16/2015 11:25:00 PM ] Phone KEY ID: 0772
[ 12/16/2015 11:25:00 PM ] Writing CERT… OK
[ 12/16/2015 11:25:00 PM ] Checking CERT status… OK
[ 12/16/2015 11:25:00 PM ] Rebooting phone… OK

Attached Images
File Type: jpg flash.jpg (125.3 KB)