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[HOW-TO] Downgrade from JB to ICS with locked bootloader

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cedesmith
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(Last edited by cedesmith; 7th October 2012 at 03:45 PM.)
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Default [HOW-TO] Downgrade from JB to ICS with locked bootloader

Hi.
I upgraded to JB without being rooted, now want root but i'm not ready to unlock bootloader yet. After reading the guide here and seen it requires unlocked bootloader i tried another approach.

WARNING: As always there is a chance something may go wrong... If you do it i'm not responsible for bricks, do it on your own risk.
WARNING: This will wipe your data
WARNING: As with all updated make sure your battery is charged


This is what i did:
1. download .30 firmware from asus site that matches your SKU
2. extract the zip file to the root of your microSD card
3. rename extracted file (ex: US_epad-user-9.4.5.30.zip as mine is US SKU) to EP201_768_SDUPDATE.zip
4. insert sdcard and power off tablet
5. press power+voldown, release them after it starts and press volup within 5 seconds to enter stock recovery
6. working android displayed .................. wait patiently to finish update...........

I think this method is peaty safe as is a normal update, no fastboot, root or unlocked bootloader.
I sincerely thought asus recovery will skip the update because is a lower version then the one installed but it did not.

TGTool - rom tool for Toshiba TG01
cLK bootloader for HTC HD2
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bckldwn
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Quote:
Originally Posted by cedesmith View Post
Hi.
I upgraded to JB without being rooted, now want root but i'm not ready to unlock bootloader yet. After reading the guide here and seen it requires unlocked bootloader i tried another approach.

WARNING: As always there is a chance something may go wrong... If you do it i'm not responsible for bricks, do it on your own risk.
WARNING: This will wipe your data
WARNING: As with all updated make sure your battery is charged


This is what i did:
1. download .30 firmware from asus site that matches your SKU
2. extract the zip file to the root of your microSD card
3. rename extracted file (ex: US_epad-user-9.4.5.30.zip as mine is US SKU) to EP201_768_SDUPDATE.zip
4. insert sdcard and power off tablet
5. press power+voldown, release them after it starts and press volup within 5 seconds to enter stock recovery
6. working android displayed .................. wait patiently to finish update...........

I think this method is peaty safe as is a normal update, no fastboot, root or unlocked bootloader.
I sincerely thought asus recovery will skip the update because is a lower version then the one installed but it did not.
Thanks, I might just try this.. the DPI really bugs me on JB!
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-lukin-
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Quote:
Originally Posted by cedesmith View Post
Hi.
I upgraded to JB without being rooted, now want root but i'm not ready to unlock bootloader yet. After reading the guide here and seen it requires unlocked bootloader i tried another approach.

WARNING: As always there is a chance something may go wrong... If you do it i'm not responsible for bricks, do it on your own risk.
WARNING: This will wipe your data
WARNING: As with all updated make sure your battery is charged


This is what i did:
1. download .30 firmware from asus site that matches your SKU
2. extract the zip file to the root of your microSD card
3. rename extracted file (ex: US_epad-user-9.4.5.30.zip as mine is US SKU) to EP201_768_SDUPDATE.zip
4. insert sdcard and power off tablet
5. press power+voldown, release them after it starts and press volup within 5 seconds to enter stock recovery
6. working android displayed .................. wait patiently to finish update...........

I think this method is peaty safe as is a normal update, no fastboot, root or unlocked bootloader.
I sincerely thought asus recovery will skip the update because is a lower version then the one installed but it did not.
Thanks bro - that worked perfect.
 
johnlgalt
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This was already posted elsewhere b/c it is how I rooted my JB 4 days ago. I think it was Praetorian or jrotsky who posted it.

I tried the same method with trying to revert 9.4.5.30 to 9.4.5.26 but that is a no go - only 10.4.4.16 will revert to 9.4.5.30
 
Pretoriano80
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Quote:
Originally Posted by johnlgalt View Post
This was already posted elsewhere b/c it is how I rooted my JB 4 days ago. I think it was Praetorian or jrotsky who posted it.

I tried the same method with trying to revert 9.4.5.30 to 9.4.5.26 but that is a no go - only 10.4.4.16 will revert to 9.4.5.30
Yeah,OP did a nice found..hehehe --> http://forum.xda-developers.com/show....php?t=1833212
 
doncieslacco
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Quote:
Originally Posted by cedesmith View Post
Hi.
I upgraded to JB without being rooted, now want root but i'm not ready to unlock bootloader yet. After reading the guide here and seen it requires unlocked bootloader i tried another approach.

WARNING: As always there is a chance something may go wrong... If you do it i'm not responsible for bricks, do it on your own risk.
WARNING: This will wipe your data
WARNING: As with all updated make sure your battery is charged


This is what i did:
1. download .30 firmware from asus site that matches your SKU
2. extract the zip file to the root of your microSD card
3. rename extracted file (ex: US_epad-user-9.4.5.30.zip as mine is US SKU) to EP201_768_SDUPDATE.zip
4. insert sdcard and power off tablet
5. press power+voldown, release them after it starts and press volup within 5 seconds to enter stock recovery
6. working android displayed .................. wait patiently to finish update...........

I think this method is peaty safe as is a normal update, no fastboot, root or unlocked bootloader.
I sincerely thought asus recovery will skip the update because is a lower version then the one installed but it did not.
Thanks for you guide, I am waiting for my TF700T, but read a lot about rooting process without unlocking bootloader, so please tell me:
What about root after your guide ?? Just use rooting instruction from here and use OTA rootKeeper and should work ??

Regards
Doncieslacco
 
johnlgalt
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Quote:
Originally Posted by doncieslacco View Post
Thanks for you guide, I am waiting for my TF700T, but read a lot about rooting process without unlocking bootloader, so please tell me:
What about root after your guide ?? Just use rooting instruction from here and use OTA rootKeeper and should work ??

Regards
Doncieslacco
JB cannot currently be rooted, so you'll need to root 9.4.5.30 first, then use OTA rootkeeper to make a backup of root and enable OTA survival (I also enabled OTA survival in superuser), then apply the JB update, and finally use OTA rootkeeper to restore root.

Also, I would highly advise not installing any apps on it in ICS, b/c a lot of people are experiencing idiosyncrasies in JB that are fixed if you perform a factory reset - since your tablet will be brand new, a factory reset will be a lot less painful with no apps installed.

If you are about to receive your tablet, and it is on 9.4.5.26 or lower, I'd seriously consider first using nvFlash to make a pure backup of the entire before updating to 9.4.5.30, b/c nvFlash does not work on 9.4.5.30 nor 10.4.4.16.

Sent from my ASUS Transformer Infinity TF700 running Android JB (rooted) via Tapatalk
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bckldwn
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Thank you OP, this worked great; back to 160 DPI!
 
_that
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Quote:
Originally Posted by johnlgalt View Post
If you are about to receive your tablet, and it is on 9.4.5.26 or lower, I'd seriously consider first using nvFlash to make a pure backup of the entire before updating to 9.4.5.30, b/c nvFlash does not work on 9.4.5.30 nor 10.4.4.16.
However that requires unlocking first,voiding your warranty.
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cferd
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Thanks OP, this worked. At first I lost the long-press function, where for example an app on the home screen is long-pressed then moved to the top to remove. The apps would always open, regardless of whether I just touched them or long-pressed them. A factory reset in recovery fixed it, in case anyone else experiences this.

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