Database Info

Process to Upgrade to JB Bootloader

So I would currently like to upgrade my tablet to the Official JB bootloader. I am rooted, and unlocked running Hiemanshu's 9/25 build. I've noticed that many of the custom ROM's I'd like to try list the Official JB Bootloader as a requirement. I have followed the nvFlash tutorial, and now currently have the AndroidRoot 9.4.5.30 Bootloader installed.
So to sum it up:
Unlocked + Rooted
I'm running Hiemanshu's 9/25 CM10 Build
I have performed nvFlash and am currently on AndroidRoot 9.4.5.30 Bootloader
My recovery is TWRP 2.2.2.3
Could anybody provide me with some instruction on where/how to find the Official JB Bootloader, and how to properly install it on my tablet? Thanks for any help!

If you want just the bootloader it is posted in the twrp thread.
Otherwise go to asus.com and download the latest rom.

lafester said:
If you want just the bootloader it is posted in the twrp thread.
Otherwise go to asus.com and download the latest rom.
Click to expand...
Click to collapse
Done! I was actually on the IRC channel the other day and Dees_Troy himself posted that same link for me. I didn't know it was flashable! I was using fastboot commands to try and flash it but it wasn't working, looks like that was a good thing!

Unrooted TF700

Can anyone tell me which Custom ROM I can apply to an rooted TF700 running ICS that will upgrade it to Jellybean and retain root?
Thanks!

No answers?

dknotty said:
Can anyone tell me which Custom ROM I can apply to an rooted TF700 running ICS that will upgrade it to Jellybean and retain root?
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You need to upgrade to stock JB before to get the JB bootloader. And when installing a custom ROM you cannot retain root - either the ROM is pre-rooted, or you have to install a root app via recovery.

dknotty said:
No answers?
Click to expand...
Click to collapse
No custom rom will upgrade your device to JB, you need to flash Asus stock JB first, or just flash JB boot loader to bring you from ICS to JB. I recommend to flash full Asus JB stock, then after that you can flash custom rom.

buhohitr said:
No custom rom will upgrade your device to JB, you need to flash Asus stock JB first, or just flash JB boot loader to bring you from ICS to JB. I recommend to flash full Asus JB stock, then after that you can flash custom rom.
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Thanks for the replies.
The problem I am having is when I flash the full Asus JB stock, I lose root. How do I upgrade to JB and keep root?

dknotty said:
Thanks for the replies.
The problem I am having is when I flash the full Asus JB stock, I lose root. How do I upgrade to JB and keep root?
Click to expand...
Click to collapse
Now solved!

[Q] Firmware

I have rooted my TF700, but have not unlocked the bootloader yet. I had to downgrade from JB to ICS so i am on the .30 firmware. Should I manually update the firmware to a JB firmware even though I am running ICS? Is there an adavatage, or will the firmware actually install JB back on? Also, when I load a custom ROM, should I also load an updated firmware?

The_Big_H said:
I have rooted my TF700, but have not unlocked the bootloader yet. I had to downgrade from JB to ICS so i am on the .30 firmware. Should I manually update the firmware to a JB firmware even though I am running ICS? Is there an adavatage, or will the firmware actually install JB back on? Also, when I load a custom ROM, should I also load an updated firmware?
Click to expand...
Click to collapse
What do you mean.
What would you like to do? Get back on JB (rooted, and locked bootloader) or do you want to flash custom roms, which require an unlocked bootloader?

I guess what I'm asking is, when I run a custom ROM, should I flash an updated firmware?
Sent from my ASUS Transformer Pad TF700T using Tapatalk HD

The_Big_H said:
I guess what I'm asking is, when I run a custom ROM, should I flash an updated firmware?
Sent from my ASUS Transformer Pad TF700T using Tapatalk HD
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That depends. I am not that familiar with downgrading, so if you could turn off your tablet.
Then press the power button while holding the volume down button.
Then you should see 'bootloader version' somewhere on the left top corner.
If you could note that down and let me know, that'd help a lot.
It could be possible that your bootloader is still the one from before downgrading. If it is, you can start flashing roms as soon as you have unlocked your bootloader.
If it has downgraded too, you have to
1) Install Voodoo ota rootkeeper & make it protect your root
2) Flash the official latest firmware version
3) open voodoo ota rootkeeper and restore your root.
I think there's a walkthrough for your case somewhere in the general thread. Look for 'walkthrough' there, you should be able to find it.

The_Big_H said:
I guess what I'm asking is, when I run a custom ROM, should I flash an updated firmware?
Sent from my ASUS Transformer Pad TF700T using Tapatalk HD
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Click to collapse
Depend on the rom build. If the rom build on JB, then yes, you need to flash JB bootloader if you're on ICS. Custom rom only contained rom and kernel.(sometime without the kernel so you need to read the instruction). So if you're on ICS you need to flash JB bootloader (either just flash the bootloader alone or flash the entire firmware which included the boot loader). Then you can flash JB custom rom. If you're talking about the new CleanRom, it's on JB (so you need JB bootloader) and has option to flash stock JB kernel or custom kernel. For me, I always flash the full Asus stock firmware first to make sure I have everything then I flash custom rom. Of course, you could just flash the stand alone JB bootloader then flash Cleanrom.

[Q] Updating your bootloader

I'm currently on Android 4.1.2 using Baked 6 and I want to upgrade to Baked 8, or anything on 4.2 for that matter. If I update a ROM, does this also mean it updates my bootloader? If not how to I properly update my bootloader without bricking my tablet? I've been reading around but there's so much data on the forums that I feel like I'm going to accidentally make a mistake

lifewater said:
I'm currently on Android 4.1.2 using Baked 6 and I want to upgrade to Baked 8, or anything on 4.2 for that matter. If I update a ROM, does this also mean it updates my bootloader? If not how to I properly update my bootloader without bricking my tablet? I've been reading around but there's so much data on the forums that I feel like I'm going to accidentally make a mistake
Click to expand...
Click to collapse
No flashing a custom rom will not upgrade your bootloader, only the stock asus firmwares will do this or a custom made blob file.
There are several methods to upgrade your bootloader to a JB 4.2 bootloader which can be found here or here. I prefer using the fastboot method for upgrading but up to you. Just make sure that once you've upgraded your bootloader to a 4.2 bootloader that you flash a -4.2 version of twrp or you will brick. I would suggest upgrading to JB 4.2 - 10.6.1.15.3 & twrp 2.5.0.0-4.2 as I find this more stable than 10.6.1.8 & twrp 2.4.4.0-4.2
If using the fastboot method and you need any help with any step just let me know.

[Q] How to identify what version Bootloader I am running

How do I identify what version of Bootloader I am running. I am rooted and unlocked and have TWRP installed and also running the Hydro7 ROM. Looking at other ROMS I need to have the JB Bootloader installed. How do I check this?
Thanks in advance.

citronax said:
How do I identify what version of Bootloader I am running. I am rooted and unlocked and have TWRP installed and also running the Hydro7 ROM. Looking at other ROMS I need to have the JB Bootloader installed. How do I check this?
Thanks in advance.
Click to expand...
Click to collapse
You can check your bootloader version in the bootloader menu/screen.
Hold vol- & power to boot to bootloader and the text in the top left of the screen will show your bootloader version.
Hydro 7 requires a JB 4.1 bootloader and is based off JB 4.1 - 10.4.2.20 - so if running Hydro 7 you are currently on a JB 4.1 bootloader.
Alot of customs roms are now based on a JB 4.2 bootloader, so if wanting to flash a rom that requires a JB 4.2 bootloader you will need to upgrade your bootloader first.
If upgrading to JB 4.2 bootloader please ensure the you flash the correct recovery, only the -4.2 versions of twrp are compatibly with the 4.2 bootloaders. Flashing a non-4.2 version of twrp or cwm will brick your device. Have a look at my how-to is sig below for more info.
If you need any help in doing this or more info just let me know.

Hi pjc21, thanks for the reply that clears up my bootloader question and your follow on information. I can now confirm that I am running bootloader "10.4.2.20" and TWRP "2.4.3.0".
So just to confirm after reading your instructions about upgrading my bootloader to "JB4.2" all I need to do is to follow your instructions and flash firmware "V10.6.1.15.3 Only for TW SKU (Android 4.2) 2013.04.23 Update" and TWRP "openrecovery-twrp-2.5.0.0-tf300t-4.2.blob".
Is this correct?
As ever your help is greatly appreciated.

citronax said:
Hi pjc21, thanks for the reply that clears up my bootloader question and your follow on information. I can now confirm that I am running bootloader "10.4.2.20" and TWRP "2.4.3.0".
So just to confirm after reading your instructions about upgrading my bootloader to "JB4.2" all I need to do is to follow your instructions and flash firmware "V10.6.1.15.3 Only for TW SKU (Android 4.2) 2013.04.23 Update" and TWRP "openrecovery-twrp-2.5.0.0-tf300t-4.2.blob".
Is this correct?
As ever your help is greatly appreciated.
Click to expand...
Click to collapse
Yes that's correct :good:
If you need any help with any steps just let me know

I currently have a TWRP v2.6.3.0 on my TF300TL, Android 4.2.1 How should I proceed?

pjc21 said:
You can check your bootloader version in the bootloader menu/screen.
Hold vol- & power to boot to bootloader and the text in the top left of the screen will show your bootloader version.
Hydro 7 requires a JB 4.1 bootloader and is based off JB 4.1 - 10.4.2.20 - so if running Hydro 7 you are currently on a JB 4.1 bootloader.
Alot of customs roms are now based on a JB 4.2 bootloader, so if wanting to flash a rom that requires a JB 4.2 bootloader you will need to upgrade your bootloader first.
If upgrading to JB 4.2 bootloader please ensure the you flash the correct recovery, only the -4.2 versions of twrp are compatibly with the 4.2 bootloaders. Flashing a non-4.2 version of twrp or cwm will brick your device. Have a look at my how-to is sig below for more info.
If you need any help in doing this or more info just let me know.
Click to expand...
Click to collapse
I am on this bootloader us-epad.10.4.2.13.20120907 and twrp 2.2 with CleanRom I will like to flash KickKass MM but i need the new TWRP.
Can you point me to a guide on how to upgrade the bootloader ?