Kindle Touch does not boot

[marmomr]

Hello,

I'm new to the forum, found this great community when googling how to unbrick Touch

Yesterday after read for a while my KT stopped responding, the screen only display top menu bar, other areas were white blank. I turned it off by pressing power button for 30 seconds, but after that not able to turn it on anymore, nothing happened after press the power button.

So I decided to unbrick it, what I have done:
1. flash diag with fastboot, use kindleSelectBoot to get into diag mode
2. dd if=mmcblk0p1-kt-5.0.0.img of=/dev/mmcblk0p1 bs=4K
3. dd if=/dev/zero of=/dev/mmcblk0p3 bs=4K

Now the Touch can boot into main mode with kindleSelectBoot, everything seems smooth after boot - great. Now the problem is it can not boot without kindleSelectBoot - when I choose restart from menu it freeze at a tree and "please wait a moment while your Kindle starts up", press power button (and press for 30 sec as well) seems has no effect, nor green LED light. To turn it on again I have to connect USB cable and choose main mode in mfgtool.

I tried to restore factory default from menu, as well as "fastboot setvar bootmode main" and "fastboot flash kernel kernel-kt-5.0.0.img" but no lucky.

Is there anything I missed in the unbrick precedure?

[knc1]

I don't have one myself, but that sounds complete to me from following the discussions here.

One possible point:
Is the battery fully charged?

That is the only thing I see missing in your description.

[marmomr]

Originally Posted by knc1

I don't have one myself, but that sounds complete to me from following the discussions here.

One possible point:
Is the battery fully charged?

That is the only thing I see missing in your description.

Thanks for the point. Battery is around 50%, I'll leave it charge to full and try again.

The weird thing is as long as it boot from within mfgtool, I can disconnect USB cable and Touch seems work great - except for not able to reboot itself w/o mfgtool.

[geekmaster]

Originally Posted by marmomr

3. dd if=/dev/zero of=/dev/mmcblk0p3 bs=4K

As I mentioned in mutilple posts, although that command worked for me, multiple people reported problems. Try

dd if=/dev/zero of=/dev/mmcblk0p3 bs=4K count=1K

It is only important to erase the beginning of the partition so that it cannot mount, which will make the system reformat it.

[knc1]

[geekmaster]

Originally Posted by knc1

@GM: Will clear this post once typo is edited.

Thanks. I have so much going on in my life right now I get in too much of a hurry sometimes...

[knc1]

[geekmaster]

Originally Posted by knc1

You need more coffee in your life:
if= of=

Ahh. That's it! My morning coffee is cold in the microwave oven and it is late afternoon here!

[marmomr]

Originally Posted by geekmaster

As I mentioned in mutilple posts, although that command worked for me, multiple people reported problems. Try

dd if=/dev/zero if=/dev/mmcblk0p3 bs=4K count=1K

It is only important to erase the beginning of the partition so that it cannot mount, which will make the system reformat it.

I tried with count=1K option, still the same.

There are some new observations. In fastboot mode, "fastboot reboot" or "fastboot continue" will not boot the Touch, but "fastboot boot main.bin" can bring it on, where main.bin is grabbed from Profile folder of KindleSelectBoot tool.

I dont have much knowledge about boot sequence but looks like something corrupts within the chain, after fastboot and before system in mmcblk0p1 is loaded. If there is some part in Touch do similar job as main.bin, I guess the part is suspicious. Is there a way to re-flash the part?

[geekmaster]

You may need to reflash the u-boot image on the mmc, if that got corrupted. You can do it with fastboot. My mind is full of other stuff right now so I do not remember the details. There are details in various posts and other documents. I would need to search for that info, but you can too.

[aditya3098]

In the diags ssh, try:

idme -d --bootmode main; sync; reboot

[marmomr]

I tried to flash u-boot with
"fastboot flash bootloader main.bin", where main.bin is grabbed from kindleselectboot tool, no luck

"idme -d --bootmode main; sync" also didn't help, after issuing the command I further confirmed it has been set to main by "idme ?", but the kindle still can not come up after reboot

Any further suggestion?

[geekmaster]

Originally Posted by marmomr

I tried to flash u-boot with
"fastboot flash bootloader main.bin", where main.bin is grabbed from kindleselectboot tool, no luck...

Huh? What "kindleselectboot tool"?

The uboot images in there are custom, and meant for loading to memory over USB with MfgTool.

[aditya3098]

Fastboot flash bootloader !?! Did you just override your bootloader ??? You may need the original bootloader images and you need to flash them on using fastboot. I would give you mine, but I don't know exactly how.

[geekmaster]

Too much messing around with the wrong options in fastboot can disable it so you need to use the serial port recovery method.