mntroot ro fails on kindle signature running 5.17.0

hanginwithdaddo · 04-18-2025, 06:40 PM

I've noticed that "mntroot ro" (mount -o remount,ro /) fails on my kindle signature 12th generation device, which has been jailbroken using Winterbreak and has MR Installer, KUAL, and kterm installed. With just these things, I tried invoking "mount -o remount,ro /" and it fails with a "device busy" message. I believe that Amazon's code is causing something to leave / open for write, possibly before another mount is done on top of a directory within the default root partition, and I'm curious to find the root cause. I was tempted to add a shell script call to some of the /etc/upstart/*.conf files to try to track down the root cause.
Has anyone else noticed this? I did see an old, related thread, but it appeared that this was with a much older device. Thanks in advance for sharing any similar results or advice that you might have.

hanginwithdaddo · 05-19-2025, 06:55 AM

This has been fixed by a subsequent 5.17 release.

04-18-2025, 06:40 PM	#1
hanginwithdaddo Enthusiast Posts: 32 Karma: 122 Join Date: Apr 2025 Location: Pennsylvania, USA Device: Kindle Signature, 12th Gen.	mntroot ro fails on kindle signature running 5.17.0 I've noticed that "mntroot ro" (mount -o remount,ro /) fails on my kindle signature 12th generation device, which has been jailbroken using Winterbreak and has MR Installer, KUAL, and kterm installed. With just these things, I tried invoking "mount -o remount,ro /" and it fails with a "device busy" message. I believe that Amazon's code is causing something to leave / open for write, possibly before another mount is done on top of a directory within the default root partition, and I'm curious to find the root cause. I was tempted to add a shell script call to some of the /etc/upstart/.conf files to try to track down the root cause. Has anyone else noticed this? I did see an old, related thread, but it appeared that this was with a much older device. Thanks in advance for sharing any similar results or advice that you might have. Last edited by hanginwithdaddo; 04-18-2025 at 06:42 PM.*

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Please, need help with Kindle Signature Edition	Blue2u	Amazon Kindle	9	09-02-2022 11:15 AM
Sell 2x Kindle Paperwhite Signature (Australia)	lkws1	Flea Market	1	06-24-2022 11:21 PM
Replacing Kindle: Signature or another Oasis?	synecdoche	Which one should I buy?	17	05-11-2022 11:22 PM
PW3 5.12.3 Way to fix jailbreak manually when mntroot is working?	bob1337	Kindle Developer's Corner	6	03-19-2020 03:03 PM
PDF to ZIP thinks I'm running Mac, fails	Viritys	Conversion	1	11-21-2017 01:24 PM

05-19-2025, 06:55 AM	#2
hanginwithdaddo Enthusiast Posts: 32 Karma: 122 Join Date: Apr 2025 Location: Pennsylvania, USA Device: Kindle Signature, 12th Gen.	This has been fixed by a subsequent 5.17 release.