How to dawngrade firmware?

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After upgrading WW 22 to WW 26 ,I lost root and I'm unable to re install it. It seems that I have to downgrade to 22 version and re install the root, but boot with 22 version on microSD doesn't shaw notification...
Thank you by advance.

Originally Posted by romeo06

After upgrading WW 22 to WW 26 ,I lost root and I'm unable to re install it. It seems that I have to downgrade to 22 version and re install the root, but boot with 22 version on microSD doesn't shaw notification...
Thank you by advance.

You can't downgrade just like that,and so far the only method is this,but is not for TF700T.
Anyway make sure "Debug USB" is enabled in Settings/Developer Options and also "Unknown Sources under Settings/Security and use Debugfs for rooting.

Thank you for your response: it's not totaly secure for Infinity .. Is there a method to re install boot without downgrade?

Thank you for your response: it's not totaly secure for Infinity .. Is there a method to re install boot without downgrade? I can't with Debugfs ...

Originally Posted by romeo06

Thank you for your response: it's not totaly secure for Infinity .. Is there a method to re install boot without downgrade? I can't with Debugfs ...

You have to provide us more info,why Debugfs is not working?AFAIK Debugfs is the only safe rooting application for Transformer Infinity,and i used that for rooting my ww 9.4.5.26 device.
BTW instead of downgrading u could use this method to get back to a stock/clean rom:
1)Download the WW 9.4.5.26 firmware from Asus site
2)Extract the .zip file somewere on your desktop (the result will be another .zip file,use it for step 3)
3)Rename the extracted archive to "EP201_768_SDUPDATE" (without the " ") and upload it to a MicroSD card
4)Insert the MicroSD card in your tablet and use this button combination to Power ON and go to recovery --> Start the tablet by pressing Volume- and POWER togheter for 5 seconds ,a message will inform you that you have 5 seconds to enter the recovery,press Volume+ when you see that message.
At this point the device will start in recovery and should start updating your firmware

Finally, root was successfull with Debugfs after removing Asus Sync (?) and several attempts. I don't find the thread I read for...
Thank you for your help.

Originally Posted by romeo06

Finally, root was successfull with Debugfs after removing Asus Sync (?) and several attempts. I don't find the thread I read for...
Thank you for your help.

Does anyone know a tutorial "how to duskgrade firmware" ?

Originally Posted by Axhole

Does anyone know a tutorial "how to duskgrade firmware" ?

No, because it is impossible, as far as I know. The only route to go is unlocking your bootloader and installing a custom ROM based on the earlier stock ROM version.

Originally Posted by MartyHulskemper

No, because it is impossible, as far as I know. The only route to go is unlocking your bootloader and installing a custom ROM based on the earlier stock ROM version.

I think he was making a joke since the thread is asking for a "dawngrade" and since its not easy, he asked for a "duskgrade" instead. I agree with you about needing an unlocked bootloader. Maybe there's a way to use the packages from [CWM] Repackaged OTA update 9.4.5.26 US/WW versions and swap blobs? blob our way down the firmware revisions?

Originally Posted by alienedd

I think he was making a joke since the thread is asking for a "dawngrade" and since its not easy, he asked for a "duskgrade" instead. I agree with you about needing an unlocked bootloader. Maybe there's a way to use the packages from [CWM] Repackaged OTA update 9.4.5.26 US/WW versions and swap blobs? blob our way down the firmware revisions?

I guess that could work, although I doubt anyone in his right mind would downgrade from .26 to .22.

Oh, and i noticed the spelling joke only after replying. Decided to keep my idiotic comment for all to see.