(TUTORIAL) How to update to Kit Kat NB4 modem on 4.3 Bootloader

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    Hello XDA, for those of us that are using the 4.3 bootloader and running an aosp rom, that would like to update to t-mobile's new N900TUVUCNB4 modem WITHOUT updating to new bootloader...follow these instructions. This is what worked for me after a bit of trial and error. My setup prior to this update was- 4.3 bootloader, MI7 firmware, philz recovery, Will's Slim Kat V7, and slimkat gapps 4.4.2.

    STEP 1- DO A NANDROID BACK-UP.

    STEP 2- DOWNLOAD VISION X3 ROM (http://xdaforums.com/showthread.php?t=2559321)

    STEP 3- DOWNLOAD CivZ-SnapKat-Rev1.9-sm_n900T-4.4.2 KERNEL (http://xdaforums.com/showthread.php?t=2613305)

    STEP 4- DOWNLOAD TRIANGLE AWAY APK (GOOGLE IT)

    STEP 5- COPY ALL 3 ITEMS IN STEPS 2,3,4 TO YOUR EXTERNAL SD CARD. BOOT INTO YOUR CUSTOM RECOVERY. DO A FACTORY DATA WIPE, WIPE CACHE & DALVIK CACHE. FLASH VISION ROM, FLASH CIVZ KERNEL, AND REBOOT. BE PATIENT....BOOT TIME TAKES ABOUT 5MINS. AFTER ROM IS BOOTED...INSTALL TRIANGLE AWAY APK USING A FILE EXPLORER AND RUN THE APP. PHONE WILL SHUT DOWN .

    STEP 6- NOW FROM YOUR PC, DOWNLOAD ODIN 307 (http://samsung-updates.com/Odin307.zip). UNZIP DOWNLOAD ON YOUR PC AND OPEN ODIN PROGRAM AND CONNECT YOUR PHONE TO PC IN DOWNLOAD MODE.

    STEP 7- DOWNLOAD MODEM.BIN THAT I HAVE EXTRACTED FROM OTA. (https://www.dropbox.com/sh/fx72lner8mud9kq/nXqmHJsfrz/modem.bin) NOW FLASH USING ODIN MAKING SURE MODEM.BIN IS SELECTED UNDER PHONE FILE BUTTON AND CHECKBOX IS CHECKED. MAKE SURE NOT TO UNPLUG DEVICE AND WAIT TILL ODIN HAS COMPLETED SUCCESSFULLY.

    STEP 8- AFTER PHONE HAS REBOOTED. PULL BATTERY AND BOOT INTO BOOTLOADER MODE AGAIN. CONNECT TO PC AND OPEN ODIN AGAIN. MAKE SURE TO HIT RESET BUTTON IN ODIN SO NOTHING IS SELECTED.

    STEP 9- DOWNLOAD YOUR CUSTOM RECOVERY OF YOUR CHOOSING...JUST MAKE SURE ITS A .TAR FILE FLASHABLE IN ODIN. FLASH RECOVERY IN ODIN UNDER PDA FILE BUTTON AND CHECKBOX CHECKED.

    STEP 10- AND FINALLY, PERFORM A CLEAN WIPE & INSTALL OF THE CUSTOM ROM YOU WERE USING PRIOR TO THIS TUTORIAL.

    ENJOY!!;)
    2
    Can you tell me why we can't just skip all of the installing of new ROM's and Triangle Away, and go straight to this step:

    STEP 7- DOWNLOAD MODEM.BIN THAT I HAVE EXTRACTED FROM OTA. (https://www.dropbox.com/sh/fx72lner8...sfrz/modem.bin) NOW FLASH USING ODIN MAKING SURE MODEM.BIN IS SELECTED UNDER PHONE FILE BUTTON AND CHECKBOX IS CHECKED. MAKE SURE NOT TO UNPLUG DEVICE AND WAIT TILL ODIN HAS COMPLETED SUCCESSFULLY.

    If that is all it takes to install the new modem, then why not just do that step?

    Confused....

    That is correct. All you need to do is flash the modem.bin in ODIN, nothing else and you will have the NB4 radio. And no, you cannot flash the modem via the recovery kernel (it appears to be locked), you have to be in download mode and I have not tried heimdall, so cannot tell you if that works.

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    1
    Can you tell me why we can't just skip all of the installing of new ROM's and Triangle Away, and go straight to this step:

    STEP 7- DOWNLOAD MODEM.BIN THAT I HAVE EXTRACTED FROM OTA. (https://www.dropbox.com/sh/fx72lner8...sfrz/modem.bin) NOW FLASH USING ODIN MAKING SURE MODEM.BIN IS SELECTED UNDER PHONE FILE BUTTON AND CHECKBOX IS CHECKED. MAKE SURE NOT TO UNPLUG DEVICE AND WAIT TILL ODIN HAS COMPLETED SUCCESSFULLY.

    If that is all it takes to install the new modem, then why not just do that step?

    Confused....
    1
    Anyone have the MI7 modem handy to grab. Also has anyone tried odin back/forth on MI7/NB4?

    I tried. Modem and full stock through Odin. No success. Once you go to NB4 modem, your stuck.
    1
    Just did this and took my LTE signal inside from 1-2 bars to maxed out signal. Thanks.

    Bars can be completely cosmetic, in fact normally don't mean much, check the dBm signal for an accurate measurement.