[SOLVED] Thinking About Jumping to MJB

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mrhomiec

mrhomiec

Senior Member
Aug 9, 2010
296
55
so from what i understand about updating the bootloader to MJB, i can only flash custom ROMs based off TouchWiz 4.3 and up, correct?

but AOSP/CM based ROMs can be any version? as long as the bootloader is supported on that ROM? and worst case scenario, i can flash CM10.1.3 (Android 4.2.2)?

currently i'm on S3Rx 2.2, which uses Android 4.1.2. there would be no point in making a nandroid backup, since the bootloader would be updated and i could no longer use this ROM, correct?

i was going to follow this guide:
http://xdaforums.com/showthread.php?t=2321310

and then use this ROM:
http://xdaforums.com/showthread.php?t=2252932

***************SOLVED:***************
flash the MJB bootloader via custom recovery following the above guide.

then flash the MJB modem via custom recovery with this guide:
http://xdaforums.com/showthread.php?t=1831898

reboot to phone (i did, not sure if necessary tho)

then reboot to recovery, flash new custom ROM.

done.

a mistake i did was i only flashed the bootloader first. rebooted, then flashed new ROM. in which case i had no wifi and data. so i flashed the modem, rebooted, no wifi and data still. rebooted into recovery, factory reset, wipe cache, wipe dalvik, and everything worked fine after that.
 
Last edited:
aybarrap1

aybarrap1

Senior Member
Mar 21, 2010
1,360
367
Guantanamo Bay
Moto X Style (Pure)
Moto X4
mrhomiec said:
so from what i understand about updating the bootloader to MJB, i can only flash custom ROMs based off TouchWiz 4.3 and up, correct?

but AOSP/CM based ROMs can be any version? as long as the bootloader is supported on that ROM? and worst case scenario, i can flash CM10.1.3 (Android 4.2.2)?

currently i'm on S3Rx 2.2, which uses Android 4.1.2. there would be no point in making a nandroid backup, since the bootloader would be updated and i could no longer use this ROM, correct?

i was going to follow this guide:
http://xdaforums.com/showthread.php?t=2321310

and then use this ROM:
http://xdaforums.com/showthread.php?t=2252932
Click to expand...
Click to collapse

You could install the MJ2 bootloader and MJB modem which would allow you the ability to go back. Once you are on MJB bootloader, there is not going back without bricking. If you ever find that you need to revert back for any reason you will be stuck. If this does not bother you, then go for it.
 
mrhomiec

mrhomiec

Senior Member
Aug 9, 2010
296
55
aybarrap1 said:
You could install the MJ2 bootloader and MJB modem which would allow you the ability to go back. Once you are on MJB bootloader, there is not going back without bricking. If you ever find that you need to revert back for any reason you will be stuck. If this does not bother you, then go for it.
Click to expand...
Click to collapse

i read somewhere that MJ2 was unstable or something. cause it was a preview leak?

but back to my first question, MJB makes it so i can only flash TouchWiz-based ROMs 4.3 and up? so i will be good to use AOSP-based ROMs of any version?
 
F

flynhawn2002

Senior Member
Feb 24, 2012
226
85
For clarification purposes:

If you upgrade to MJB you will have the 4.3 KNOX apps (OS) and KNOX bootloader (Firmware). You can easily root following this guide: http://xdaforums.com/showthread.php?t=2538991

Once rooted by following the guide noted above you will have the 4.3 KNOX (OS) removed BUT not the KNOX bootloader. With the KNOX bootloader you will never be able to downgrade the bootloader. What that means is that you can never use odin to flash an older firmware or you will brick!

Now that your MJB is rooted you can flash any ROM you want 4.1.2, 4.2.2, 4.3, 4.4.2 since most custom ROMS dont include the bootloader in the ROM package.

Hope this clears things up?
 
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H

hoke88

Member
Apr 14, 2013
43
10
flynhawn2002 said:
For clarification purposes:

If you upgrade to MJB you will have the 4.3 KNOX apps (OS) and KNOX bootloader (Firmware). You can easily root following this guide: http://xdaforums.com/showthread.php?t=2538991

Once rooted by following the guide noted above you will have the 4.3 KNOX (OS) removed BUT not the KNOX bootloader. With the KNOX bootloader you will never be able to downgrade the bootloader. What that means is that you can never use odin to flash an older firmware or you will brick!

Now that your MJB is rooted you can flash any ROM you want 4.1.2, 4.2.2, 4.3, 4.4.2 since most custom ROMS dont include the bootloader in the ROM package.

Hope this clears things up?
Click to expand...
Click to collapse

Yes it does! Thank you!!
 
vbetts

vbetts

Senior Member
Jun 21, 2010
1,029
66
33
Toledo Ohio
I'm on the latest bootloader and modem and I haven't had any trouble flashing any aosp based roms. Only thing I was told you might have to take the bootloader line out of the update script, but so far I haven't had to at all.
 
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mrhomiec

mrhomiec

Senior Member
Aug 9, 2010
296
55
flynhawn2002 said:
If you upgrade to MJB you will have the 4.3 KNOX apps (OS) and KNOX bootloader (Firmware). You can easily root following this guide: http://xdaforums.com/showthread.php?t=2538991
Click to expand...
Click to collapse

just wanted to clarify, i'm already rooted, so i was going to follow the guide from my first post (since this guide has ZIP files i can flash in CWM):
http://xdaforums.com/showthread.php?t=2321310
Flashing in recovery
If you've downloaded a flashable .ZIP from above, copy it to your SD card or internal storage. Reboot your phone into recovery mode (you can do this by holding "Volume Up" and "Home" while powering on your device; let go of the buttons when you see "Recovery booting..." in blue text in the top left of the screen) and install the .ZIP as an update. Reboot, and you're done.
Note: After flashing in recovery, you need to reboot before you (and ROM installers) actually see the new version number.
Click to expand...
Click to collapse

would i reboot first, then flash a new ROM?

or should i flash the bootloader, then immediately flash the new ROM?

UPDATE: so i ended up just following the ZIP file guide:
http://xdaforums.com/showthread.php?t=2321310

and now i don't have data or wifi. i flashed the modem from here:
http://xdaforums.com/showthread.php?t=1831898

ANOTHER UPDATE:
after i went into recovery, factory reset, wipe cache, wipe dalvik. the phone is recognizing wifi and data now. woo!
 
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    flynhawn2002
    For clarification purposes:

    If you upgrade to MJB you will have the 4.3 KNOX apps (OS) and KNOX bootloader (Firmware). You can easily root following this guide: http://xdaforums.com/showthread.php?t=2538991

    Once rooted by following the guide noted above you will have the 4.3 KNOX (OS) removed BUT not the KNOX bootloader. With the KNOX bootloader you will never be able to downgrade the bootloader. What that means is that you can never use odin to flash an older firmware or you will brick!

    Now that your MJB is rooted you can flash any ROM you want 4.1.2, 4.2.2, 4.3, 4.4.2 since most custom ROMS dont include the bootloader in the ROM package.

    Hope this clears things up?
    View
    1
    vbetts
    vbetts
    I'm on the latest bootloader and modem and I haven't had any trouble flashing any aosp based roms. Only thing I was told you might have to take the bootloader line out of the update script, but so far I haven't had to at all.
    View

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