[GUIDE] Fix N910A Boot Loop - Unknown Baseband (step by step)

[bsisco]

Hello friends

I have a few people asking questions on solution for N910 boot-loop, I want to make step-by-step guide to answer all questions.

Problem caused by changing *#9090# and possibly downgrade as well.

Takes time, several tries, don't worry.

1. Downgrade to 4.4.4 via Odin. Extract OC4, extract Odin, open Odin, select four files into correct position (BL, AP, CP, CSC) 4.4.4 OC4 Odin 3.09 (Samsung Mobile drivers required)
2. Once on 4.4.4 or below, enable developer options by tapping "build version" several times, enable USB debugging & mock location, and install KingRoot 4.0.0.233 to phone. Caution, newer versions did not work for me.
3. Open "Command Prompt" and type "adb version" should reply with "Android Debug Bridge version x.x.x", if does not, change to the correct directory where adb is installed via "cd" command. Need ADB? Here
4. These next two steps can be a little tricky as the phone often reboots before completed, must work quickly, I suggest copying the long command, then paste when ready.
5. Connect to working WiFi. Turn off your phone, reboot, or wait for it to reboot itself. Soon as phone turns on, open KingRoot, soon as WiFi connected notification appears, touch button in center of KingRoot app, soon as KingRoot reaches 30%, began adb commands.
6. ADB commands: first command "adb shell", second command "su", third command "dd if=/dev/zero of=/dev/block/mmcblk0p10 | dd if=/dev/zero of=/dev/block/mmcblk0p13 | dd if=/dev/zero of=/dev/block/mmcblk0p14 | dd if=/dev/zero of=/dev/block/mmcblk0p15 | dd if=/dev/zero of=/dev/block/mmcblk0p16" phone will reboot or you can reboot and after reboot boot-loop and unknown baseband will be fixed! Can now write new IMEI via "Write Cert" and possibly "Write QCN" if any network troubles, then all good to go!
7. Any questions feel free to contact me on skype: brandon.sisco or phone: 949.482.7058 I'm happy to walk you through any steps.

Once you see results, I have worked hard on this complete solution for many weeks, I would appreciate any donation. Secure paypal donate here

Thank you ecs87 for the help with adb wipe efs commands

[Yong Vannak]

help brother i have S3 korae E210L unknown baseband and imei help thank

[citifone]

Thanks for this useful post..but I've been trying to install Kingroot.apk many times now and it won't install..It keeps staying on installing....Of course I checked unknown source..Do you know why it's not installing?

[yalamandareddy]

use only king root 4.0.0233

[citifone]

Originally Posted by yalamandareddy

use only king root 4.0.0233

thanks for quick reply...yes I did, that's the version I tried to install

[citifone]

Originally Posted by citifone

thanks for quick reply...yes I did, that's the version I tried to install

Edit: My bad...It installed now. I uncheck Verify Apps in security settings it installed...Once again thanks, now I will try to fix it with your instruction to see if it fixes the bootloop and no basebankd problem..thanks

[citifone]

Your method works. Phone now has baseband and no more restart bootloop problem. It still has no imei but should be able to fix easily with boxes. Thanks so much for sharing....

[Moderate]

Originally Posted by bsisco

Hello friends

I have a few people asking questions on solution for N910 boot-loop, I want to make step-by-step guide to answer all questions.

Problem caused by changing *#9090# and possibly downgrade as well.

Takes time, several tries, don't worry.

1. Downgrade to 4.4.4 via Odin. Extract OC4, extract Odin, open Odin, select four files into correct position (BL, AP, CP, CSC) 4.4.4 OC4 Odin 3.09 (Samsung Mobile drivers required)
2. Once on 4.4.4 or below, enable developer options by tapping "build version" several times, enable USB debugging & mock location, and install KingRoot 4.0.0.233 to phone. Caution, newer versions did not work for me.
3. Open "Command Prompt" and type "adb version" should reply with "Android Debug Bridge version x.x.x", if does not, change to the correct directory where adb is installed via "cd" command. Need ADB? Here
4. These next two steps can be a little tricky as the phone often reboots before completed, must work quickly, I suggest copying the long command, then paste when ready.
5. Connect to working WiFi. Turn off your phone, reboot, or wait for it to reboot itself. Soon as phone turns on, open KingRoot, soon as WiFi connected notification appears, touch button in center of KingRoot app, soon as KingRoot reaches 30%, began adb commands.
6. ADB commands: first command "adb shell", second command "su", third command "dd if=/dev/zero of=/dev/block/mmcblk0p10 | dd if=/dev/zero of=/dev/block/mmcblk0p13 | dd if=/dev/zero of=/dev/block/mmcblk0p14 | dd if=/dev/zero of=/dev/block/mmcblk0p15 | dd if=/dev/zero of=/dev/block/mmcblk0p16" phone will reboot or you can reboot and after reboot boot-loop and unknown baseband will be fixed! Can now write new IMEI via "Write Cert" and possibly "Write QCN" if any network troubles, then all good to go!
7. Any questions feel free to contact me on skype: brandon.sisco or phone: 949.482.7058 I'm happy to walk you through any steps.

Once you see results, I have worked hard on this complete solution for many weeks, I would appreciate any donation. Secure paypal donate here

Thank you ecs87 for the help with adb wipe efs commands

Can we update after fixing the reboot loop to lollipop and write the cert file from octopus support.

I have got one SM N910A i entered code*#9090*# and select USB option and it went into reboot loop.Wrote the modem only from 5.0.2 firmware,didn't work.

Your solution comes into rescue.Thanks for your hard work i appreciate it.

Br,
Moderate

[citifone]

Phone seems to work now but it's stuck in Factory Mode On and keep turn wifi off and might have other problems associate with this mode but have not known yet. I already wipe factory and wipe cache and reflash the firmware but still the same. Any suggestion to fix this problem?

[repairsuniverse]

Will this work on N915a I can't seem to get su threw adb.

[bsisco]

Originally Posted by repairsuniverse

Will this work on N915a I can't seem to get su threw adb.

I can help with you, su requires Root or Temp Root, which Build Version is your N915a? I can help look for a root solution

[bsisco]

Originally Posted by citifone

Phone seems to work now but it's stuck in Factory Mode On and keep turn wifi off and might have other problems associate with this mode but have not known yet. I already wipe factory and wipe cache and reflash the firmware but still the same. Any suggestion to fix this problem?

Can you provide a picture and or explain the factory mode on?

[bsisco]

Originally Posted by citifone

Your method works. Phone now has baseband and no more restart bootloop problem. It still has no imei but should be able to fix easily with boxes. Thanks so much for sharing....

Yes if you are in Orange County area can use my box

[patodog]

I can use this solution with N910F

[jjmpda]

People are stuck In factory mode after reseting efs thru adb PM good day to all!!!!