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Old 03-16-2016, 09:20 AM   #1
Oldgeeza
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fw5.7.3 can i Jailbreak?

Hi I have a Paper white 2 (6th Generation) with 5.7.3 firmware can this be jailbroken easy.
Thanks for help
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Old 03-16-2016, 09:43 AM   #2
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No.

There is only a software Jailbreak for 5.6.5 nothing higher and unlikely there will be anything for a while/at all.

Not sure of the serial jailbreaks limitations.
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Old 03-16-2016, 09:53 AM   #3
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Quote:
Originally Posted by Oldgeeza View Post
Hi I have a Paper white 2 (6th Generation) with 5.7.3 firmware can this be jailbroken easy.
No. As far as I know, hardware access is required (i.e. soldering on the connections fro a serial port) for firmware > 5.6.5
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Old 03-17-2016, 09:12 AM   #4
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Moved to the dev forum, which is where such questions belong.
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Old 03-17-2016, 10:10 AM   #5
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Quote:
Originally Posted by oblox View Post
No.

There is only a software Jailbreak for 5.6.5 nothing higher and unlikely there will be anything for a while/at all.

Not sure of the serial jailbreaks limitations.
A serial port connection gives the person access to the "Recovery Menu" -

The Recovery Menu does not check update firmware packages for "Downgrade Attack" (Lab126's phrase for it).

(At least we haven't had any reports to the contrary.)

Logically, it can't -
It is intended to recover in situations where there might not be information available about the most recently installed firmware version.
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Old 03-17-2016, 01:30 PM   #6
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Actually, it does (I have an old IDA screenshot posted somewhere of the relevant code). It's just that (current) *factory* recovery packages do not include version information .

Last edited by NiLuJe; 03-17-2016 at 01:32 PM.
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Old 03-17-2016, 02:19 PM   #7
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Quote:
Originally Posted by NiLuJe View Post
Actually, it does (I have an old IDA screenshot posted somewhere of the relevant code). It's just that (current) *factory* recovery packages do not include version information .
I was guessing.

People have contacted me on how to downgrade using the recovery menu -
And from their silence - assumed it had worked for them.
Maybe it destroyed their Kindle and they just never wrote back.

- - - -

IT did work on the erased Kindle which was restored using Fastboot.
That was not a factory recovery package but just the regular, Amazon posted update package.

So it may check, but being unable to check must not be a fatal error.

In another case -
The update package was signed but the signature was found to be 128 bytes long instead of 256 bytes -
Again, only a nasty log message, but not a fatal error to the load process.

= = = = =

All corner cases I hope to find time to play with.
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Old 03-17-2016, 03:16 PM   #8
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Yeah, the shortsig thing vaguely rings a bell...
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Old 03-17-2016, 03:24 PM   #9
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Quote:
Originally Posted by NiLuJe View Post
Yeah, the shortsig thing vaguely rings a bell...
I think that could be leveraged.

Of course, it would probably take a --create-corrupted option to KindleTool.

Somehow that doesn't feel right, after all the work and effort to make KindleTool do things bitwise correct -
to next give it an option that only copies the first half of the signature to the package . . . .

Plus - people would use that new option in strange ways.

Last edited by knc1; 03-17-2016 at 03:26 PM.
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Old 03-20-2016, 11:46 AM   #10
erehwon
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fw5.7.3 can i Jailbreak?

Is there a way to downgrade from 5.7.3 to 5.6.5 to allow jailbreak then?
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