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#1 |
Seeking for Graal
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Join Date: Jul 2013
Location: France
Device: Kobo Forma / Onyx Boox Page
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Hi,
I was playing around with my boox page and tried to unpack/repack the stock recovery to enable ADB. And now, I am stuck in a bootloop I can't exit from. What I did: - Dumped stock recovery via EDL - Unpacked the recovery.img using Magisk Tools (https://topjohnwu.github.io/Magisk/tools.html) - Opened the ramdisk.cpio archive - Edited the prop.default with the following options (found on the net, the goal was to enable adb on recovery): - ro.secure=0 - ro.adb.secure=0 - ro.debuggable=1 - Saved my changes and repacked the recovery.img - Booted into bootloader and ran "fastboot boot patched-recovery.img" Now, I am stuck in a bootloop that I can't exit from. Long pressing the power button does not help, trying to catch adb or fastboot neither. Trying to boot under Qualcomm EDL 900e (holding volume buttons), no chance... I also tried to change the active slot to b, but fastboot keeps waiting for a device. I finally opened my Page and disconnected the battery. When I restart it.... still bootloop. I need your help there.... what should I do? I cannot find any reset point on the mother board, and I don't know where to look for the EDL 9008 test points. Help ![]() Motherboard pictures to come soon. Last edited by Anghirrim; 05-20-2024 at 03:19 PM. |
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#2 |
Seeking for Graal
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Karma: 16198
Join Date: Jul 2013
Location: France
Device: Kobo Forma / Onyx Boox Page
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Here are the pictures.
On the mother board, the battery connector is on the bottom left. And the USB-C connector. Suprisingly, the motherboard is labelled for the Boox Leaf 2 Pro. |
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#3 |
Wizard
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Device: Nook NST, Glow2, 3, 4, '21, Kobo Aura2, Poke3, Poke5
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Onyx has varied between very obvious (Poke3) to very obscure (Poke5) in the layout of UART and USB_BOOT ("EDL") test points.
I think the 5 points at the bottom of the big photo are the most probable. But don't just go shorting things (unless you want to vaporize your device). Do you have a DVM? Even a cheapy if it has "diode test". |
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#4 | |
Seeking for Graal
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Quote:
Is this OK for you? It has the diode sign on the 2000ohm part. Last edited by Anghirrim; 05-20-2024 at 04:31 PM. |
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#5 |
Wizard
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That's hard to tell, but let's go with it.
Device on. DVM on 20 DCV --- (not ~) Black lead on nice metal shield under the eMMC. Red lead on each of the five points, measure the voltage. Write it down Only for points that measure zero-ish (0.little): Switch to "beeper mode" and measure again. Write it down. What did you get? |
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#6 | |
Seeking for Graal
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Quote:
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#7 |
Wizard
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#8 |
Seeking for Graal
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Ok, no risk to fry anything with 20V (just anxious lol)?
I'll try tomorrow, it's getting late here. Thanks for the help!! Edit: Ah no stupid me... It'll just measure how much goes through the DVM... Last edited by Anghirrim; 05-20-2024 at 05:16 PM. |
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#9 |
Seeking for Graal
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#10 |
Wizard
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That looks good.
I'm not sure about your meter. Doesn't it give numbers too in "beep" mode? So, here's what you do: Device on, USB connected. Meter in beep mode. Black on tin Red first on the far left point. Hold the power button for 10+ seconds, release. Watch for 05c6/9008 on USB. Didn't work? Try again with far right point. |
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#11 | |
Seeking for Graal
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Quote:
When you speak about "black on tin", you're referring to the metallic shield, right? And for the meter, I don't think it gives numbers while beeping. |
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#12 |
Seeking for Graal
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Side question, do you know if the faulty recovery caused that bootloop?
It's crazy that a "fastboot boot" query remains active even after a battery disconnection. I would have expected it to be volatile. That being said, I ran the command twice. First, no error, but the device did not reboot. Second time, I had an error message (can't remember what), and it went into bootloop. |
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#13 | |
Seeking for Graal
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Quote:
I managed to boot into EDL 9008 mode and inject the loader. However, I had to release the tips of my DVM and stop connecting the shield with the right point. This resulted in loosing EDL and my computer started complaining about a device it could not recognize. Now, to be able to flash something and stay in the EDL 9008 mode, should I find a stable way to keep those two points connected? |
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#14 |
Wizard
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After it shows 9008 you shouldn't need to hold the probe any longer unless you reboot and want to go back to EDL.
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#15 |
Seeking for Graal
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Thread | Thread Starter | Forum | Replies | Last Post |
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U-boot with fastboot support for k3 | giorgio130 | Kindle Developer's Corner | 4 | 12-01-2012 09:34 AM |