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ICS Bootloader vs JB Bootloader

Guys,
a post with a flashable bootloader for both ICS and JB would be useful.
I've borked a JB rom and my CWM backups were not working because of the bootloader.
I had to flash ASUS stock back to get the bootloader.
Some zip files would be useful in case someone wants to go back to ICS
Much appreciated.
Abe

what if the JB bootloader sets some e-fuses and reverting to the ICS bootloader bricks the tablet?
without NVFLASH I wouldn't even attempt such a thing.
abe_cedar said:
Guys,
a post with a flashable bootloader for both ICS and JB would be useful.
I've borked a JB rom and my CWM backups were not working because of the bootloader.
I had to flash ASUS stock back to get the bootloader.
Some zip files would be useful in case someone wants to go back to ICS
Much appreciated.
Abe
Click to expand...
Click to collapse

untermensch said:
what if the JB bootloader sets some e-fuses and reverting to the ICS bootloader bricks the tablet?
without NVFLASH I wouldn't even attempt such a thing.
Click to expand...
Click to collapse
Asus wouldn't b that nice would they?
On Galaxy Nexus I do that all the time. They have an ICS bootloader and a JB one. I can check the version in Fastboot mode.
I am trying to flash some JB ROMS and if I fail all my CWM backups are useless since the bootloader is the incorrect one..
The tab gets stuck after restoring I assume because of the incorrect bootloader.
Thanks
Abe

I attached the ICS bootloader, I would strongly suggest you wait until NVFLASH
for the tf300t is released to mess with the bootloader because you have no way
back if it does not work (no fastboot).

I Will
untermensch said:
I attached the ICS bootloader, I would strongly suggest you wait until NVFLASH
for the tf300t is released to mess with the bootloader because you have no way
back if it does not work (no fastboot).
Click to expand...
Click to collapse
Yea,
any news on NV flash?
I saw a tweet from Asus in some thread saying that they are not going to support it at ALL.
I hope is not true
Thanks for the zip.
Always good to have files just in case.

abe_cedar said:
Yea,
any news on NV flash?
I saw a tweet from Asus in some thread saying that they are not going to support it at ALL.
I hope is not true
Thanks for the zip.
Always good to have files just in case.
Click to expand...
Click to collapse
In the official cm10 thread it states that nvflash is not going to work with the jellybean bootloader. I think they where close to a release before jellybean dropped.

here is the post.
http://forum.xda-developers.com/showpost.php?p=31244180&postcount=164

.30 firmware bootloader overwrites TF300 JB bootloader

Move to dev if better suited there.
Thanks goes to saltxyz for this find.
For those of us on the TF300 JB bootloader you can revert back to ICS using my instructions in my other post here only be sure to grab the new .30 firmware: http://forum.xda-developers.com/showthread.php?t=1873635
Not only is ICS running smoothly again thanks to the bootloader but THE .30 BOOTLOADER ALLOWED THE JB KERNEL TO RUN!!
That's right I was able to flash my own TF300 ROM which has everything but the kernel removed from the blob and it ran JB while leaving the bootloader intact.

nice! good to hear asus has things figured out.

I'm guessing this is part of the prep for JB with the bootloader supporting both.

Mike02z said:
I'm guessing this is part of the prep for JB with the bootloader supporting both.
Click to expand...
Click to collapse
I can only assume so.

Can we just flash the .30 zip file in TWRP?
rooted/unlocked

amaury48 said:
Can we just flash the .30 zip file in TWRP?
rooted/unlocked
Click to expand...
Click to collapse
Yes, but you have to extract US_epad_user_9_4_5_30_20120907_UpdateLauncher.zip to US_epad-user-9.4.5.30.zip and flash it.

amaury48 said:
Can we just flash the .30 zip file in TWRP?
rooted/unlocked
Click to expand...
Click to collapse
I've flashed it several times today. You will have to re-install TWRP via fastboot, and then flash SuperUser, if you care about root.

LMMT said:
I've flashed it several times today. You will have to re-install TWRP via fastboot, and then flash SuperUser, if you care about root.
Click to expand...
Click to collapse
I know it's stated that you have already done this, but I really don't want to screw something up and I don't have NVFlash to recover from a hard brick.Can you, or others, confirm that you can indeed move from the .13 JB bootloader to the .30 ICS bootloader successfully and then be able to use the NVFlash?
Edit: Oops, I guess this is for the TF700 only, or will this work on the actual TF300 as well? Anyone know?
-Nate

herschwolf said:
I know it's stated that you have already done this, but I really don't want to screw something up and I don't have NVFlash to recover from a hard brick.Can you, or others, confirm that you can indeed move from the .13 JB bootloader to the .30 ICS bootloader successfully and then be able to use the NVFlash?
Edit: Oops, I guess this is for the TF700 only, or will this work on the actual TF300 as well? Anyone know?
-Nate
Click to expand...
Click to collapse
Actually a user in the nvflash thread said he tried it for the TF300 and it worked.
Sent from my EVO using xda premium

Root JB

Hello, i had a Transformer Infinity Pad with unlocked Bootloader and Custom Recovery... Is there a way to root the new Version, because i am so stupid and forget to backup the root..
i am a little noob

manson28031991 said:
Hello, i had a Transformer Infinity Pad with unlocked Bootloader and Custom Recovery... Is there a way to root the new Version, because i am so stupid and forget to backup the root..
i am a little noob
Click to expand...
Click to collapse
No, not yet. For now, you have to flash back to .30, root it then use OTA keeper to save a backup, then upgrade to JB, then restore root.

manson28031991 said:
Hello, i had a Transformer Infinity Pad with unlocked Bootloader and Custom Recovery... Is there a way to root the new Version, because i am so stupid and forget to backup the root..
i am a little noob
Click to expand...
Click to collapse
You could try to flash Superuser with this recovery and maybe it will work.If after you flashed the Superuser zip you still don't have root,downoad the SuperSU app from market.

buhohitr said:
No, not yet. For now, you have to flash back to .30, root it then use OTA keeper to save a backup, then upgrade to JB, then restore root.
Click to expand...
Click to collapse
Is it possible to flash back to .30 without an unlocked bootloader ?

slainer68 said:
Is it possible to flash back to .30 without an unlocked bootloader ?
Click to expand...
Click to collapse
No, you have to have an unlocked bootloader.

buhohitr said:
No, not yet. For now, you have to flash back to .30, root it then use OTA keeper to save a backup, then upgrade to JB, then restore root.
Click to expand...
Click to collapse
How would one flash back to .30 if they're already on JB? I did the same thing...updated to JB without saving root. I do have an unlocked bootloader.

Grady said:
How would one flash back to .30 if they're already on JB? I did the same thing...updated to JB without saving root. I do have an unlocked bootloader.
Click to expand...
Click to collapse
If you are unlocked just follow the method i've posted in my previous post,it should work without going back to 30.

Pretoriano80 said:
If you are unlocked just follow the method i've posted in my previous post,it should work without going back to 30.
Click to expand...
Click to collapse
Yes this method does work if you are unlocked, thanks for the idea......

Yes, I can also confirm this method works.

Woohoo! I have root again!
I was gettin worried, downgrading seems like such a hassle
OFFICIAL JB, TF700, WW SKU, C70 serial 64gb
I just wanted that 3.1.x kernel SO bad.
Now to finally start tweaking/debloating it. I can't believe this BLOATED STOCK firmware runs as "smoothly" as it does, compared to stock .22, stock .26 and stock .30 it is hands down worth the hassle.
I have JB that has portrait mode, IPS+ and I can still plug my NTFS formatted portable hard drive into it, that NEVER worked on any of the custom JB roms working around the 2.6.x kernel.
now to see how vnc-loopback-linux-over-android works!
all the excitement, all over again. I've only had this thing for a little over two weeks, but it's so much fun. I love being on the ground floor with new devices, so many risky experimental things to try.
I'm f'n stoked! Haven't gotten bored with it yet!
Keep up the good work everyone!

slainer68 said:
Is it possible to flash back to .30 without an unlocked bootloader ?
Click to expand...
Click to collapse
Yes, you can follow the soft brick recovery in the "All-In-One" thread to downgrade from JB to ICS .30 without unlocking your boot loader.

So, let me get this straight.
Revert to .30, then root, then use Superuser (I have Elite) to OTA save, then apply the JB update, then use Superuser to un OTA save?

How do I tell if I have a JB bootloader?

I downgraded to ICS using the method I found here: http://forum.xda-developers.com/showthread.php?t=1925230 and followed all the steps. The I unlocked and rooted my infinity with success. The only thing I didn't do was let my device upgrade to the stock JB to get the JB bootloader. I flashed CleanRom JB Rom and everything seems to be working fine, pretty smooth rom. So how do I tell if I have the JB bootloader??

SugarCoatedAngel said:
I downgraded to ICS using the method I found here: http://forum.xda-developers.com/showthread.php?t=1925230 and followed all the steps. The I unlocked and rooted my infinity with success. The only thing I didn't do was let my device upgrade to the stock JB to get the JB bootloader. I flashed CleanRom JB Rom and everything seems to be working fine, pretty smooth rom. So how do I tell if I have the JB bootloader??
Click to expand...
Click to collapse
If you followed the instruction and asked you to flash full Asus firmware .30, then you don't have JB bootloader. You only have ICS bootloader.

SugarCoatedAngel said:
I downgraded to ICS using the method I found here: http://forum.xda-developers.com/showthread.php?t=1925230 and followed all the steps. The I unlocked and rooted my infinity with success. The only thing I didn't do was let my device upgrade to the stock JB to get the JB bootloader. I flashed CleanRom JB Rom and everything seems to be working fine, pretty smooth rom. So how do I tell if I have the JB bootloader??
Click to expand...
Click to collapse
If you downgraded you were already on JB... you couldn't really have downgraded if you weren't. If you did downgrade from JB to ICS, that means you have the JB bootloader. The JB bootloader sticks with you, even if you downgrade to ICS.

Firebrazer said:
If you downgraded you were already on JB... you couldn't really have downgraded if you weren't. If you did downgrade from JB to ICS, that means you have the JB bootloader. The JB bootloader sticks with you, even if you downgrade to ICS.
Click to expand...
Click to collapse
Thanks Firebraze, thats what I thought. Someone told me otherwise, but I couldn't tell. thanks again

buhohitr said:
If you followed the instruction and asked you to flash full Asus firmware .30, then you don't have JB bootloader. You only have ICS bootloader.
Click to expand...
Click to collapse
Hmm. well if I don't have JB bootloader, how am I able to have a JB rom?

SugarCoatedAngel said:
Hmm. well if I don't have JB bootloader, how am I able to have a JB rom?
Click to expand...
Click to collapse
Maybe it works even with the ICS bootloader.
I know a nice way to find out which bootloader you have: Look in /proc/cmdline - if it contains "vmalloc" then it's the ICS bootloader. They removed this parameter in the JB bootloader.

You cross-posted this question in the CleanROM thread where I just answered. I'll copy my reply out here:
The easiest way to check is booting with VOL_DOWN pressed -- if you ''immediately'' get four options (with "RCK" being the leftmost), you're running a JB bootloader.

MartyHulskemper said:
The easiest way to check is booting with VOL_DOWN pressed -- if you ''immediately'' get four options (with "RCK" being the leftmost), you're running a JB bootloader.
Click to expand...
Click to collapse
IIRC this feature was already introduced with 9.4.5.30.

MartyHulskemper said:
You cross-posted this question in the CleanROM thread where I just answered. I'll copy my reply out here:
The easiest way to check is booting with VOL_DOWN pressed -- if you ''immediately'' get four options (with "RCK" being the leftmost), you're running a JB bootloader.
Click to expand...
Click to collapse
If you hold vol down while booting, then select recovery, the bootloader version will be displayed briefly in the top left corner...

_that said:
IIRC this feature was already introduced with 9.4.5.30.
Click to expand...
Click to collapse
Ran out of thanks for today, so I'll have to do it manually: thanks.
I didn't flash .30 stock, but as far as I know, only the JB bootloader did this. You may very well be right, however, because of the aformentioned fact I did not actually flash the "full" .30.
Furthermore, the current version of CleanROM has the prerequisite of a JB bootloader, so in this case it is a moot point: the OP has a JB bootloader (check Scott's OP at: http://forum.xda-developers.com/showthread.php?t=1919851)

MartyHulskemper said:
Furthermore, the current version of CleanROM has the prerequisite of a JB bootloader
Click to expand...
Click to collapse
Such a "prerequisite" can be any of "I've never tried anything else" or "I don't want users to try anything else to reduce possible support issues" or "It really doesn't work".

How to Downgrade bootloader

I am currently on cromi-xenogenesis 5.0.3 with bootloader 10.6.1.27.1 and twrp 2.6.1.0. What I want to do is switch bootloaders to 10.6.1.14.4 so I can install the new nvflash for jb. Will this work with my current rom setupd? Will I be able to simply install the bootloader with my recovery? If not what steps would I have to go through in order to get onto this bootloader?

laod said:
I am currently on cromi-xenogenesis 5.0.3 with bootloader 10.6.1.27.1 and twrp 2.6.1.0. What I want to do is switch bootloaders to 10.6.1.14.4 so I can install the new nvflash for jb. Will this work with my current rom setupd? Will I be able to simply install the bootloader with my recovery? If not what steps would I have to go through in order to get onto this bootloader?
Click to expand...
Click to collapse
You should never flash a bootloader from a different device, this is a sure way to brick your device!
If you currently have a 10.6.1.27.1 bootloader, you apparently don't have a TF700 and are in the wrong forum. Or you are confusing bootloader version with ROM version.

edit: nevermind you are right, I do have a tf700 but i was looking at the rom version. So how do I know my bootloader then?

Piggyback on this one
laod said:
edit: nevermind you are right, I do have a tf700 but i was looking at the rom version. So how do I know my bootloader then?
Click to expand...
Click to collapse
Hi, just saw this post, and was wondering the same thing.
My build is: JOP40.US_epad-10.6.1.14.10-20130801.
This is a bone stock TF700, still locked, and not rooted. All updates have been from ASUS.
I'm guessing that 10.6.1.14.10 is the bootloader, and I'm interested in using the new Flatline version of NVFlash.
Looking at the instruction page, they only mention 10.6.1.14.4, so I'm also wondering if either the Flatline is compatible with .10, or do I need to find a way to downgrade the bootloader to .4
Any advice?
Thanks!

TRHinFC said:
Hi, just saw this post, and was wondering the same thing.
My build is: JOP40.US_epad-10.6.1.14.10-20130801.
This is a bone stock TF700, still locked, and not rooted. All updates have been from ASUS.
I'm guessing that 10.6.1.14.10 is the bootloader, and I'm interested in using the new Flatline version of NVFlash.
Looking at the instruction page, they only mention 10.6.1.14.4, so I'm also wondering if either the Flatline is compatible with .10, or do I need to find a way to downgrade the bootloader to .4
Any advice?
Thanks!
Click to expand...
Click to collapse
It says the boot loader version when on the screen before you boot the recovery image. You have to flash a modified boot loader. If you have 10.6.1.14.10 then you'll be fine since you are installing a different bootloader
Sent from my ASUS Transformer Pad TF700T using Tapatalk HD

laod said:
It says the boot loader version when on the screen before you boot the recovery image. You have to flash a modified boot loader. If you have 10.6.1.14.10 then you'll be fine since you are installing a different bootloader
Sent from my ASUS Transformer Pad TF700T using Tapatalk HD
Click to expand...
Click to collapse
Cool! Thanks! Really want a faster tablet and not a brick, so appreciate your help.
Take it easy

Okay, for those who haven't heard of this (if you're like me and don't read the devel forum regularly):
Flatline (NVFlash for Jellybean) is at https://www.androidroot.mobi/pages/guides/tegra3-guide-nvflash-jellybean/
and the discussion thread is http://cleanimport.xda/index.php?threads/2455925/