05-14-2022, 06:23 AM | #16 |
Grand Sorcerer
Posts: 6,568
Karma: 84812983
Join Date: Nov 2011
Location: Tampa Bay, Florida
Device: Kindles
|
One thing to consider is that Kindles report the build number to Amazon and that controls how the server interacts with the device. Putting in an incorrect value may cause problems and also advertise to Amazon that the device is jail broken.
|
05-15-2022, 02:13 PM | #17 | |
Grand Sorcerer
Posts: 5,323
Karma: 98809518
Join Date: Apr 2011
Device: pb360
|
Quote:
But going in the other direction (lower version number), could this be a way to block KFX delivery? (possibly subject to constraint of lowest version ever available for a particular model) |
|
05-15-2022, 02:31 PM | #18 | |
Grand Sorcerer
Posts: 5,323
Karma: 98809518
Join Date: Apr 2011
Device: pb360
|
Quote:
|
|
05-15-2022, 08:21 PM | #19 | |
Grand Sorcerer
Posts: 6,568
Karma: 84812983
Join Date: Nov 2011
Location: Tampa Bay, Florida
Device: Kindles
|
Quote:
Unfortunately the user interface of the Kindle became seriously messed up and unusable, with a mix of old and new UI elements. The top drop down menu could not be activated. Library view disappeared. After opening a book it was impossible to close it through the UI. I finally restored the version number and did a factory reset to make it usable again. Update: It appears that during my testing the Kindle "updated" itself to version 5.13.7 which was an older version than was actually running on the device. That may have been the actual cause of the UI failure. I recommend that anyone setting a fake build version should block OTA updates first. Last edited by jhowell; 05-15-2022 at 09:19 PM. |
|
05-16-2022, 03:03 AM | #20 |
Guru
Posts: 940
Karma: 10500004
Join Date: Feb 2010
Location: Serbia
Device: Kindle PW5, Kobo Libra 2, Kindle PW1
|
Hmm, wasn't the factory image for PW3 5.6.5 and 5.6.1.1 the last available firmware update for PW1??
|
05-16-2022, 03:18 AM | #21 |
Member
Posts: 21
Karma: 10
Join Date: Apr 2022
Device: KO3
|
Do you think that there is any possibility to fake build number in original update file to downgrade firmware without jailbreak?
|
05-16-2022, 07:48 AM | #22 | |
Grand Sorcerer
Posts: 6,568
Karma: 84812983
Join Date: Nov 2011
Location: Tampa Bay, Florida
Device: Kindles
|
Quote:
You can see the full list of firmware versions for each Kindle model on Amazon's Source Code Notice page. For the PW3 (7th Generation) released in 2015 the original firmware version (last on the list) was Kindle_src_5.6.1.1_2634130033.tar.gz. |
|
05-16-2022, 07:53 AM | #23 |
Grand Sorcerer
Posts: 6,568
Karma: 84812983
Join Date: Nov 2011
Location: Tampa Bay, Florida
Device: Kindles
|
|
05-16-2022, 08:25 AM | #24 |
Guru
Posts: 940
Karma: 10500004
Join Date: Feb 2010
Location: Serbia
Device: Kindle PW5, Kobo Libra 2, Kindle PW1
|
Ok, then my PW3 must have come with 5.6.5 installed when I've bought it in August 2015. I definitely didn't install a firmware update before jailbreak-ing it and I've definitely used @Branch Delay's jailbreak exploit.
It is interesting how there is no source code posted for PW5's 5.14.0.1 Last edited by shamanNS; 05-16-2022 at 08:30 AM. |
05-16-2022, 03:10 PM | #25 | |
Grand Sorcerer
Posts: 5,323
Karma: 98809518
Join Date: Apr 2011
Device: pb360
|
Quote:
https://www.mobileread.com/forums/sh...5&postcount=12 |
|
05-16-2022, 03:27 PM | #26 | |||
Grand Sorcerer
Posts: 5,323
Karma: 98809518
Join Date: Apr 2011
Device: pb360
|
Quote:
Does the book have images? If so, were they in an azw6 file, or was everything in the azw3? Quote:
I can see why they would use version number to select download type and why it would be attractive to use to block downgrades. But it seems it would be a prime generator of new bugs and strange side effects to have it affect UI. I wonder how many lines they have to tweak every time the version changes solely because of this. Quote:
Thanks for being a pioneer and risking the arrows. |
|||
05-16-2022, 03:36 PM | #27 |
Kindle priest
Posts: 36
Karma: 50153
Join Date: Oct 2019
Location: Kharkiv,Ukraine
Device: Kindle Paperwhite 5
|
Funny note: if u want block ANY updates(even via reboot) - type 999999 in build number
BE CAREFUL!Do it only if u have SSH access to device and u know root password DO NOT RESET DEVICE AFTER THAT! |
05-16-2022, 03:46 PM | #28 | ||
Grand Sorcerer
Posts: 5,323
Karma: 98809518
Join Date: Apr 2011
Device: pb360
|
Quote:
because of effects on server interaction (file type delivered, etc). And recent results show that the UI can be affected. Quote:
|
||
05-16-2022, 04:04 PM | #29 | ||
Grand Sorcerer
Posts: 6,568
Karma: 84812983
Join Date: Nov 2011
Location: Tampa Bay, Florida
Device: Kindles
|
Quote:
Quote:
Putting a DO_FACTORY_RESTORE file in /mnt/us and rebooting cleaned it up. |
||
05-16-2022, 04:22 PM | #30 | |
Grand Sorcerer
Posts: 6,568
Karma: 84812983
Join Date: Nov 2011
Location: Tampa Bay, Florida
Device: Kindles
|
Quote:
I don't know how Amazon treats interactions with a device reporting an unexpected build number. They might retain the capabilities associated with last valid build number received or switch to a default set. In any case it is likely to be reported in an error log somewhere. Actually I now believe that the UI problem was due to the unexpected firmware downgrade. |
|
Tags |
firmware, firmware downgrade |
|
Similar Threads | ||||
Thread | Thread Starter | Forum | Replies | Last Post |
Alternative method to downgrade KT2? | DanielSt | Kindle Developer's Corner | 12 | 02-26-2022 04:03 PM |
Firmware Update Is there any method to downgrade kindle paperwhite from 5.4.4 to 5.3.5? | mycityofsky | Amazon Kindle | 84 | 07-29-2015 04:45 AM |
How to downgrade fv. from 3.1 to 3.0.3 | apofview | Kindle Developer's Corner | 3 | 02-12-2011 09:56 AM |
downgrade to 1.0.0? | prsnOOb | Sony Reader | 1 | 10-08-2008 04:34 AM |