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#1 |
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Karma: 484026
Join Date: Mar 2015
Device: KT2, PW2
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[Solved] How to unbrick a frozen KT2 (with a broken kernel)
Hello everyone!
Backstory Spoiler:
I was stuck with this: ![]() (a screen that looks like diags but actually it was just the afterimage of the last shown thing; clicking did nothing, obviously the device wasn't in diags but rather in a broken boot cycle because somehow the kernel got corrupted) Huge thanks to @katadelos for guiding me on how to solve this issue! Solution What I ended up doing was disassemble the device and short the test pad TM401 (which activates BOOT_MODE_0) by actually connecting a wire between TP1706 (which gives us 3.3V of power, you can use a different source for that as well) and the left side of the rectangular diode right below the D1505 marking (which seems to be directly connected to the desired TM401) as shown on the image below: ![]() While the wire is connected, you should restart the device by either shorting the reset pins to ground or pressing and holding the power button for 20 seconds. Once I did that, the device appeared as SE Blank MEGREZ: Code:
[ 2470.327595] usb 1-13: new high-speed USB device number 7 using xhci_hcd [ 2470.476311] usb 1-13: New USB device found, idVendor=15a2, idProduct=0063, bcdDevice= 0.01 [ 2470.476319] usb 1-13: New USB device strings: Mfr=1, Product=2, SerialNumber=0 [ 2470.476324] usb 1-13: Product: SE Blank MEGREZ [ 2470.476327] usb 1-13: Manufacturer: Freescale SemiConductor Inc [ 2470.478445] hid-generic 0003:15A2:0063.0008: hiddev1,hidraw4: USB HID v1.10 Device [Freescale SemiConductor Inc SE Blank MEGREZ] on usb-0000:00:14.0-13/input0 Spoiler:
After running imx_usb_loader the device was recognized as an Amazon Kindle and it even showed the serial number: Code:
[ 2491.260357] usb 1-13: new high-speed USB device number 8 using xhci_hcd [ 2491.409288] usb 1-13: New USB device found, idVendor=1949, idProduct=d0e0, bcdDevice= 0.01 [ 2491.409294] usb 1-13: New USB device strings: Mfr=1, Product=2, SerialNumber=3 [ 2491.409297] usb 1-13: Product: Kindle [ 2491.409300] usb 1-13: Manufacturer: Amazon [ 2491.409303] usb 1-13: SerialNumber: 062060XXXXXXXXXX (X for redacted) Code:
nicolasmart@ubuntu:~/Desktop/KindleXubuntu/Fastboot-Kindle$ sudo ./fastboot flash kernel uImage downloading 'kernel'... OKAY [ 0.082s] writing 'kernel'... OKAY [ 0.169s] finished. total time: 0.251s nicolasmart@ubuntu:~/Desktop/KindleXubuntu/Fastboot-Kindle$ sudo ./fastboot reboot rebooting... finished. total time: 0.000s nicolasmart@ubuntu:~/Desktop/KindleXubuntu/Fastboot-Kindle$ ![]() ![]() Huge thanks once again for all of the support and I hope I helped somebody! Original post: Spoiler:
Last edited by nicolasmart; 07-03-2021 at 05:14 PM. |
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#2 |
BLAM!
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Join Date: Jun 2010
Location: Paris, France
Device: Kindle 2i, 3g, 4, 5w, PW, PW2, PW5; Kobo H2O, Forma, Elipsa, Sage, C2E
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A PW2 is not a KT2, and I can never remember if the KT2 isn't the very device that introduced the new partition layout...
In any case: outside of possibly a serial recovery, it's dead, Jim. |
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#3 |
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Karma: 484026
Join Date: Mar 2015
Device: KT2, PW2
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Update: Maybe it's not completely dead. For some reason it now makes Windows play the hardware inserted sound upon connecting via USB, however it disconnects again shortly after and I have no clue what it's being detected as.
I will try connecting it to Ubuntu tho to see what happens and if imx_usb_loader will be able to make it boot my desired uBoot. |
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#4 |
Sometimes active.
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Karma: 484026
Join Date: Mar 2015
Device: KT2, PW2
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Updated first post with the solution found by @katadelos
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#5 |
Member
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Karma: 10
Join Date: Sep 2016
Device: KT2, Kindle 7th Gen
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I am trying to use uboot_2009-08-lab126_wario_usb_fastboot.bin with imx_usb_loader on a KT2 after getting "Product: SE Blank MEGREZ" but after that I get a USB disconnect on dmesg and that's it. Can't use fastboot. Any ideas?
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