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Old 04-11-2018, 01:37 AM   #16
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Assume I am on the jailbroken device with 5.9.4 firmware and got uImage and rootfs.img from, say, 5.8.7.0.1 update bin. Will this script downgrade the firmware?
Code:
#!/bin/sh

dd if=/mnt/us/uImage of=/dev/mmcblk0 bs=4096 seek=65 
dd if=/mnt/us/rootfs.img of=/dev/mmcblk0p1 bs=4096
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Old 04-11-2018, 09:06 AM   #17
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Almost.

*) Take a look at my Backup script to confirm that offset (seek) of 65*4096 for the uImage
(the backup script tests the recovered uImage to be certain of both its start and its length)

*) The runme script is a function of the 'main' operating system and here you are replacing the system that is running.

A *nix system allows open files that are in-use to be replaced (hot replacement), but I don't think replacing the entire system while it is running is a "good idea".
That is something which has always been avoided in the series 5.x de-bricking and I feel best sticking with what geekmaster found should be avoided.

Now a runme script that reboots the system into "diags", so that you can replace the "main" system when it is shut down (cold replacement), that is what geekmaster always posted in the past.

(Note: He is in gamma knife surgery this morning, so it is not a good idea to be PM'ing him on this subject now.)

Sorry, I don't have a link to the backup script, but it is in a thread started by myself, that should make it easier to find.

Last edited by knc1; 04-11-2018 at 09:09 AM.
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Old 04-11-2018, 10:38 AM   #18
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Thank you, I have your backup script, I'll look at it. I see it is not a good idea to overwrite running system.
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Old 08-10-2018, 11:26 AM   #19
AnimalOfArt
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Has anyone tried to shutdown the device completely by using

Code:
#!/bin/sh
halt
?
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Old 08-10-2018, 11:57 AM   #20
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Quote:
Originally Posted by AnimalOfArt View Post
Has anyone tried to shutdown the device completely by using

Code:
#!/bin/sh
halt
?
https://www.mobileread.com/forums/sh...d.php?t=211677
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Old 08-10-2018, 02:45 PM   #21
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Quote:
Originally Posted by j.p.s View Post
Thank you for your quick answer. Yes, that's where I got the little piece of code from. I just wanted to know if somebody already tried it and can confirm that it works on a jailbroken KOA2. I have the possibility to get a device with factory fw, and the fact that I could turn it off completely once it's jailbroken, would make the decision easier for me.
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Old 08-10-2018, 04:31 PM   #22
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Quote:
Originally Posted by AnimalOfArt View Post
Thank you for your quick answer. Yes, that's where I got the little piece of code from. I just wanted to know if somebody already tried it and can confirm that it works on a jailbroken KOA2. I have the possibility to get a device with factory fw, and the fact that I could turn it off completely once it's jailbroken, would make the decision easier for me.
You didn't specify the device.

It works fine on the Voyage, but it turns out I've never tried it on the KOA2.

I just did. It halts fine, but it shows the boy sitting under a tree and says something like:
"Please wait while your Kindle starts" even though it is off. When the power button is pressed, it boots as normal.

ETA: It's been so long since I used it on the Voyage that I forgot the Voyage also shows the boy under the tree screen even though it is off.

Last edited by j.p.s; 08-10-2018 at 04:53 PM.
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Old 08-11-2018, 02:52 AM   #23
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Quote:
Originally Posted by j.p.s View Post
You didn't specify the device.

It works fine on the Voyage, but it turns out I've never tried it on the KOA2.

I just did. It halts fine, but it shows the boy sitting under a tree and says something like:
"Please wait while your Kindle starts" even though it is off. When the power button is pressed, it boots as normal.

ETA: It's been so long since I used it on the Voyage that I forgot the Voyage also shows the boy under the tree screen even though it is off.
Sorry for not specifying the device. Because KOA2 is the only device yet, which has to take the uncomfortable way to start extensions through runme scripts (all others can use KUAL), I thought this thread is all about KOA2.

Thank you very much for testing and yes this is the same behavior as on the Voyage. I had one last year but it got broken, so I will try to get the new Oasis with factory fw.
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