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Old 11-06-2018, 11:39 PM   #3271
rnb86
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Hi, I have JB Kindle PW3 (2016). I did JB long time ago, and everything was working great. I am not sure what was my daily driver FW version. May be 5.8.4 or so. Few months ago, I accidentally updated my PW3 to 5.9.7. Since then Kindle launcher does not starts: "Application Error". Although KUAL (I think it is a booklet) runs, and I can start and use KOReader and apps, that I had before. I just would like to see Kindle launcher running again.

Is there any way to roll back to previous FW version? What If I reset a reader, then flash factory_initial_5.7.4.bin (the one that I used to JB my Kindle), then JB once more, install fix and apps, and then update to latest version in which Kindle launcher would work?
Is is a good idea or I will end up with a brick?
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Old 11-07-2018, 12:27 AM   #3272
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Found a manual will it work?

https://www.mobileread.com/forums/sh...d.php?t=288836
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Old 11-07-2018, 01:40 AM   #3273
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@rnb86: Err, what exactly are you calling "Kindle launcher"?

But to answer your question: I'm going with no. When anything mentions a specific version or version range as far as FW 5.x is concerned, assume it's for a very good reason, and honor it.

Last edited by NiLuJe; 11-07-2018 at 01:43 AM.
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Old 11-07-2018, 02:42 AM   #3274
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It does work for firmwares less than 5.8.10.
Noone has reported for firmwares 5.9.*. You can be the first one.
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Old 11-07-2018, 10:08 AM   #3275
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My Kindles SN starts: G090 G105 ........
Currently FW: 5.9.7
"Kindle launcher" is a book with an egg on it, and a label "Kindle luancher". But also I had a vlasovsoft installed (CoolReader, chess, file manager etc)
Now I have to start a book KUAL to start my apps. KUAL has a button to start vlasovsoft too.

May be try to flash it with a COM cable?
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Old 11-07-2018, 10:20 AM   #3276
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It does work for firmwares less than 5.8.10.
Noone has reported for firmwares 5.9.*. You can be the first one.
I will probably try to follow that instructions, but in a month, so I would have a PC with COM, and a soldering iron and stuff for any case.
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Old 11-07-2018, 10:45 AM   #3277
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Now I have to start a book KUAL to start my apps. KUAL has a button to start vlasovsoft too.
It is the only way to start CoolReader and other apps since 5.9.2. It is by design and cannot be fixed.
You can try to downgrade though.
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Old 11-07-2018, 10:46 AM   #3278
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- - - -

May be try to flash it with a COM cable?
NO.
Kindles have 1.8 volt serial ports, not 12 volt serial like a COM port.
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Old 11-07-2018, 11:03 AM   #3279
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Now I have to start a book KUAL to start my apps. KUAL has a button to start vlasovsoft too.

May be try to flash it with a COM cable?
Your Kindle is still jailbroken correctly. You're simply run into the nasty 5.9.x problem with now missing support for kindlets (aka "active documents": these AZW2 files that could be started directly under 5.8.x firmwares via their own icon).

You now MUST make the detour via Kual as you already did describe. You can delete the now useless azw2 files for KUAL and Vlasovsoft Launcher. Their icon will remain in your library anyway - IMHO no solution known. You should never-ever have updated to a fw 5.9.x ... by staying with 5.8.11 you'd not have these problems...
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Old 11-07-2018, 06:34 PM   #3280
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Thank you everyone for response. I have to think before taking risk of downgrading. Also it is different theme, I'd better move to related theme instead of posting here about a downgrading jailbroken PW3. Thanks.

PS: moving here https://www.mobileread.com/forums/sh...d.php?t=288836
and to 4pda.ru
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