I337_NB1toNC1_KeepRoot_OTA.zip & I337UCUFNC1_100%_Stock_Rooted_ROM(4/24/2014)

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muniz_ri

Senior Member
Jun 27, 2012
3,257
4,981
Hi,

I have tried to downgrade using ODIN (from NC1 to MK2) and selected the (AP) and navigated to the .tar file and click start. In Odin i got failed message. I tried to restart but I'm stuck at a screen saying "firmware upgrade encountered an issue. please select recovery mode in kies and try again." I am using a AT&T I337 . All I'm seeing on my screen is "firmware upgrade encountered an issue. Please help

At the top left it says:

ODIN MODE
PRODUCT NAME: SGH-I337
CURRENT Binary : Samsung official
SYSTEM STATUS: Official
knox kernel lock 0x0
knox warranty 0x0
csd-conf-lsb 0x30

Go into download mode and start over from Step 1. But this time try a different USB port on your computer.
 

loganfarrell

Senior Member
Mar 11, 2014
285
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Google Pixel 8 Pro
so you're sayin' even though i already did the downgrade method previously (to get to rooted nb1), i have to go through the process again? just want to make sure. thanks.

No. Not all of the process. But if you're on the NB1 ROM then you can easily backup your data in SS, wipe in SS, flash the NC1 ROM, Odin Kernel, restore data in SS. Not too bad in terms of time if you download the files and make a backup ahead of time.
 
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  • 33
    Method# 1: This "Keep Root" method uses a modified version of the official NB1 to NC1 OTA Update.zip to upgrade while maintaining User Data and Root Access! The file is flashed in Safestrap and the end result is a 100% Stock, Rooted, NC1 Device. Proceed at your own risk!


    **Closing my thread now that a direct rooting method is available. Thanks to @kevp75 and @loganfarrell for all of the support provided to me and others in this thread!**: http://xdaforums.com/showthread.php?t=2783157


    **Important Notice**: If you are currently on factory stock, unrooted NB1 or NC1 follow the instructions in Post# 3!:


    Donations Welcome!





    **Prerequisite** You must be on a 100% Stock NB1 system, except for root and safestrap, before proceeding with this method! The update will fail if any NB1 system files have been modified or deleted, e.g. thru Xposed, flashing Tether AddOn.zip, etc. You must first restore the stock files or flash the I337UCUFNB1_100%_Stock_Rooted_ROM. Or, instead update to NC1 by flashing the I337UCUFNC1_100%_Stock_Rooted_ROM from Post# 3 below.

    Here it is: I337_NB1toNC1_KeepRoot_OTA.zip

    And here: I337_NB1toNC1_KeepRoot_OTAwBL.zip (This version contains the NC1 bootloader, MK2 bootloader users will not be able to flash back to factory stock MK2 after flashing).

    1. Place the I337_NB1toNC1_KeepRoot_OTA.zip in the root of your ext sdcard.
    2. Make certain that you have installed the latest Safestrap-JFLTE-3.72-kk-B01.apk.
    3. Boot into Safestrap recovery but Do Not Wipe!.
    4. Flash the NB1toNC1_KeepRoot_OTA.zip in the "Stock Slot." Once flashing is complete press "Home" and reboot into "Download Mode".
    5. Last, flash the I337_NC1_Stock_Kernel in Odin's PDA slot(AP in Odin v3.09+).

    Once complete the phone will reboot then "optimize apps" before completely rebooting. Done!





    Known Issue: Safestrap.apk will force close after updating to NC1 using this method, however Safestrap recovery will continue to function. Optional: To manually uninstall safestrap recovery use Es File Explorer to delete system/etc/safestrap and system/bin/e2fsck, then rename system/bin/e2fsck.bin to e2fsck (save these files if you wish to manually reinstall Safestrap at a later time).






    I337UCUFNC1_100%_Stock_Rooted_TetherAddOn
    Instructions:
    1. After flashing and booting into I337UCUFNC1_100%_Stock_Rooted_ROM or I337_NB1toNC1_KeepRoot_OTA.zip,
    2. Place the AddOn in ext sdcard.
    3. Reboot into Safestrap recovery and flash the AddOn in Stock Slot (Do Not Wipe Prior to Flashing)
    4. Reboot. Done!
    32
    I337UCUFNC1_100%_Stock_Rooted_ROM

    Method# 2: The following is not a root method in the "traditional" sense, e.g. Saferoot, Kingo. This is a workaround to our inability to root KitKat 4.4.2. However the end result is a Fully Functioning 100% Stock, Rooted, NC1 Device. Proceed at Your Own Risk!.


    **Note**: The process below has been proven to work without exception when the instructions are followed to the letter. Should you run into trouble please consider re-reviewing the instructions to identify your error before requesting assistance. Thank you.


    Here it is: I337UCUFNC1_100%_Stock_Rooted_ROM

    And here: I337UCUFNC1_100%_Stock_Rooted_ROMwBL (This version contains the NC1 bootloader, MK2 bootloader users will not be able to go back to factory stock MK2 after flashing).

    1. Place the I337UCUFNC1_100%_Stock_Rooted_ROM in the root of your ext sdcard.
    *2. Download the I337_Downgrade_to_MK2 file, extract the .tar and flash in PDA slot in Odin(AP in Odin v3.09+) to obtain semi-functioning(no-wifi) MK2.
    3. Use your favorite root method to root MK2, e.g. Saferoot, Kingo Root App, then install the latest Safestrap-JFLTE-3.72-kk-B01.apk.
    4. Boot into Safestrap recovery, perform an "Advanced Wipe" and wipe everything except ext sdcard.
    5. Flash the ROM zip in the "Stock Slot." Once complete press "Home," then reboot into "Download Mode".
    6. Flash the I337_NC1_Stock_Kernel in PDA slot in Odin(AP in Odin v3.09+).

    *MK2 users can skip Step# 2.

    Once complete the phone will reboot and pause on the white AT&T splash screen for about 1-2 minutes before completely booting into the ROM. Done!



    - It's recommended that you use Safestrap's Backup/Restore function to backup and restore User Data prior to and after flashing the ROM. Make sure and thank @loganfarrell for discovering this very useful feature.
    - In general, to flash a different 4.4.2 Safestrap Custom ROM after flashing this ROM reboot into Safestrap recovery, perform an advanced wipe, and wipe everything but ext sdcard. Then flash the new ROM in the "Stock Slot" and reboot (Refer to the other ROM's dedicated thread for any additional requirements or for assistance. Please limit the discussion in this thread to the 100%_Stock_Rooted_ROM and the KeepRoot OTA zip).


    Known Issues: None!






    I337UCUFNC1_100%_Stock_Rooted_TetherAddOn
    Instructions:
    1. After flashing and booting into I337UCUFNC1_100%_Stock_Rooted_ROM or I337_NB1toNC1_KeepRoot_OTA.zip,
    2. Place the AddOn in ext sdcard.
    3. Reboot into Safestrap recovery and flash the AddOn in Stock Slot (Do Not Wipe Prior to Flashing)
    4. Reboot. Done!
    12
    Extras (No need to flash, provided as a courtesy).

    Flash in PDA slot in Odin (AP in Odin v3.09+)

    I337_NC1_Stock_Modem

    I337_NC1_Stock_Recovery
    4
    Uploading New NC1_100%_Stock_Rooted_ROM Files

    @loganfarrell. @kevp75

    FYI: I was able to resolve the Safestrap force close issue on the NC1_100%_Stock_Rooted_ROM. Uploading new files.....
    3
    @muniz_ri Nice Job My Friend! :good: Let's all hit the Thanks Button for and awesome job Here!