12-01-2021, 06:44 PM
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#1 |
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rm -rf /
  Posts: 219
Karma: 3333683
Join Date: Nov 2019
Location: United Kingdom
Device: K5, KT, KT2, KT3, KT4, KV, PW2, PW3, PW4, PW5
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Source code for Secure Boot and Fastboot lockdown features
I've been attempting to boot the Kindle X Migu firmware on a standard KT3 over the last couple of days and noticed something interesting about the GPL sources for that device - they include the missing headers and source code implementing the Secure Boot and Fastboot lockdown features on the hardened U-Boot builds found on recent Kindle devices.
There's nothing in there that stands out to me as immediately useful for jailbreaking purposes (the ability to unlock a production device seems to rely upon verifying a RSA-PSS message against the public key accessible using fastboot) but I've uploaded it to GitHub in case anyone wants to have a look: https://github.com/katadelos/ufbl-features-lab126 |
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12-03-2021, 03:28 PM
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#2 |
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Enthusiast
Posts: 35
Karma: 10
Join Date: Jan 2016
Device: PW2 PW3 DPT-RP1
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It says "Amazon FireOS common kernel signing tool" in the script. Had a quick look and it *seems* like they are doing secure boot the right way.
Makes me wonder what happens to those echo devices. BTW recent fireos exploits rely on loopholes inside mtk bsp rather than bootloader. Anyway congrats for this nice finding! |
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12-04-2021, 08:48 PM
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#3 |
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Enthusiast
Posts: 41
Karma: 10
Join Date: Mar 2021
Device: KPW 4 and KT2
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Good news and we might be able to load custom OS on newer devices as older devices such as PW3 can run android 4.4.2
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12-05-2021, 08:21 AM
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#4 |
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Member
Posts: 10
Karma: 12
Join Date: Oct 2020
Device: KPW4
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yes ,you can flash the Kindle X Migu firmware on a standard KT3 with TWRP Recovery.
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12-17-2021, 12:04 PM
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#5 |
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Enthusiast
Posts: 41
Karma: 10
Join Date: Mar 2021
Device: KPW 4 and KT2
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I heard that xmigu is actually running android 5 and there is some way to install custom app on it(by serial port), but I dont know the specfic way of doing so.
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01-17-2022, 03:41 AM
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#6 |
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Junior Member
Posts: 7
Karma: 8988
Join Date: Mar 2021
Location: China
Device: KPW3 KT2 KT3 KV Boox Nova3
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Please check your PM list.
I boot the Kindle X Migu firmware on a standard KT3 successfully. |
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01-17-2022, 04:21 AM
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#7 | |
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Enthusiast
Posts: 36
Karma: 50
Join Date: Mar 2020
Device: Kindle Paperwhite 4
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What was that FlashAndroid Kual applet? Just Curious.
Quote:
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01-17-2022, 07:51 AM
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#8 | |
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Member
Posts: 10
Karma: 12
Join Date: Oct 2020
Device: KPW4
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Quote:
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01-17-2022, 09:04 AM
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#9 | |
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Junior Member
Posts: 7
Karma: 8988
Join Date: Mar 2021
Location: China
Device: KPW3 KT2 KT3 KV Boox Nova3
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Quote:
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01-18-2022, 04:11 AM
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#10 |
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Enthusiast
Posts: 36
Karma: 50
Join Date: Mar 2020
Device: Kindle Paperwhite 4
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Thanks for your reply @ygjsz
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