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[Q] Unbrick TF300T Without Unlocking Bootloader

OP yourignhere

5th July 2014, 01:09 PM   |  #1  
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I have a TF300T that I need to fix. It gets stuck in an infinite boot loop, and when I try to run the recovery kernel, it will not work. I'm trying to flash CWM or a new rom onto it to get it running again, but the bootloader is not unlocked. Is there any way that I can unbrick the tablet without needing to unlock the bootloader, or is there any way I can unlock the bootloader without running the apk file Asus gives? I can't get past the recovery menu.
5th July 2014, 04:41 PM   |  #2  
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I have the same issue with a tf300t after attempting to update it. It's stuck on the boot screen with text in the top-left corner reading "signature match". Nothing happens, I've rebooted multiple times using multiple methods, but nothing works. I did manage to get my pc to recognize the tablet for a short while, but it didn't recognize the device.

Please, is there anything we can do besides getting a new tablet?

Edit: I tried adb and fastboot. No success. My tablet won't boot into the required state for these methods. Is there any other way to get it back to working order besides sending it to ASUS?
Last edited by Voidac; 5th July 2014 at 06:01 PM.
5th July 2014, 06:42 PM   |  #3  
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So neither of you are able to get to the screen that has the three icons?

If you can get to that screen you should be able to do a cold reset. This is the wipe data option. In other words, you will lose all your data.

Also, you might be able to flash stock SKU if you can get to that screen.

Sent from my SM-N900T using XDA Free mobile app

---------- Post added at 05:40 PM ---------- Previous post was at 05:40 PM ----------

Quote:
Originally Posted by Voidac

I have the same issue with a tf300t after attempting to update it. It's stuck on the boot screen with text in the top-left corner reading "signature match". Nothing happens, I've rebooted multiple times using multiple methods, but nothing works. I did manage to get my pc to recognize the tablet for a short while, but it didn't recognize the device.

Please, is there anything we can do besides getting a new tablet?

Edit: I tried adb and fastboot. No success. My tablet won't boot into the required state for these methods. Is there any other way to get it back to working order besides sending it to ASUS?

So you can't get to any screen on your tablet? What is your process? Which buttons are you holding?

Sent from my SM-N900T using XDA Free mobile app

---------- Post added at 05:42 PM ---------- Previous post was at 05:40 PM ----------

Quote:
Originally Posted by yourignhere

I have a TF300T that I need to fix. It gets stuck in an infinite boot loop, and when I try to run the recovery kernel, it will not work. I'm trying to flash CWM or a new rom onto it to get it running again, but the bootloader is not unlocked. Is there any way that I can unbrick the tablet without needing to unlock the bootloader, or is there any way I can unlock the bootloader without running the apk file Asus gives? I can't get past the recovery menu.

If you can get to the recovery menu, try doing a cold reset. It will wipe all of your data. You click to move over to wipe data and select it. Then you should be able to boot and install that app to unlock your tablet.

Sent from my SM-N900T using XDA Free mobile app
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5th July 2014, 10:45 PM   |  #4  
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Well, I've used the power button & Vol Down in an attempt to cold boot it or to get to the other options. No luck even getting to that screen.
6th July 2014, 12:48 AM   |  #5  
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Quote:
Originally Posted by Voidac

Well, I've used the power button & Vol Down in an attempt to cold boot it or to get to the other options. No luck even getting to that screen.

Is your tablet charged?

Sent from my SM-N900T using XDA Free mobile app
6th July 2014, 03:24 AM   |  #6  
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Quote:
Originally Posted by andrewnelson23

Is your tablet charged?

I've tried from plugged, unplugged. Full battery and letting it sit for almost a day to completely drain the battery.
6th July 2014, 03:30 AM   |  #7  
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Quote:
Originally Posted by andrewnelson23

So neither of you are able to get to the screen that has the three icons?

If you can get to that screen you should be able to do a cold reset. This is the wipe data option. In other words, you will lose all your data.

Also, you might be able to flash stock SKU if you can get to that screen.

Sent from my SM-N900T using XDA Free mobile app

---------- Post added at 05:40 PM ---------- Previous post was at 05:40 PM ----------



So you can't get to any screen on your tablet? What is your process? Which buttons are you holding?

Sent from my SM-N900T using XDA Free mobile app

---------- Post added at 05:42 PM ---------- Previous post was at 05:40 PM ----------



If you can get to the recovery menu, try doing a cold reset. It will wipe all of your data. You click to move over to wipe data and select it. Then you should be able to boot and install that app to unlock your tablet.

Sent from my SM-N900T using XDA Free mobile app

I was able to do a cold reset and the tablet's working fine now, just waiting on the wifi connection (which is taking abnormally long) to get going so I can unlock the bootloader.
6th July 2014, 05:44 AM   |  #8  
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Quote:
Originally Posted by Voidac

I've tried from plugged, unplugged. Full battery and letting it sit for almost a day to completely drain the battery.

So does it just go black or what?

Sent from my SM-N900T using XDA Free mobile app

---------- Post added at 04:44 AM ---------- Previous post was at 04:42 AM ----------

Quote:
Originally Posted by yourignhere

I was able to do a cold reset and the tablet's working fine now, just waiting on the wifi connection (which is taking abnormally long) to get going so I can unlock the bootloader.

Did you get it going?

Sent from my SM-N900T using XDA Free mobile app
6th July 2014, 10:09 AM   |  #9  
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Quote:
Originally Posted by andrewnelson23

So does it just go black or what?

Sent from my SM-N900T using XDA Free mobile app

---------- Post added at 04:44 AM ---------- Previous post was at 04:42 AM ----------



Did you get it going?

Sent from my SM-N900T using XDA Free mobile app

It won't connect to wifi. It says "authenticating" and just stays there forever until I turn off the screen, then it says "not connected"
6th July 2014, 12:34 PM   |  #10  
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Quote:
Originally Posted by yourignhere

It won't connect to wifi. It says "authenticating" and just stays there forever until I turn off the screen, then it says "not connected"

You can try to flash the original SKU and see if that fixes it?

Sent from my SM-N900T using XDA Free mobile app

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