How to downgrade a jail-broken 5.6.1 kpw2? - Page 2

Ruskie_it · 11-30-2014, 10:40 AM

Quote:

Originally Posted by knc1

It tries its best to **not** install our non-Amazon packages.

Which just means that we will have to transition away from using the Amazon provided package installer during the coming year.

I don't get this. It tries its best, true, but it fails: you can use MRPI which is probably even better, and all the user has to do is simply place the bin in another directory and the launch at his will.
Better yet: I would possibly agree on a reason NOT TO UPDATE. But once you did update, since you can install your hacks anyway using MRPI, that is no reason to go back - expecially because that's way more complicate than install new packages.

Indeed a reason could have been "It is evil because I cannot run/install app XYZ on fw 5.6.1", that was something I was expecting from OP. But then again, I was willing to know which hack, exactly, was not working in 5.6.1

knc1 · 11-30-2014, 10:49 AM

Quote:

Originally Posted by Ruskie_it

I don't get this. It tries its best, true, but it fails: you can use MRPI which is probably even better, and all the user has to do is simply place the bin in another directory and the launch at his will.
Better yet: I would possibly agree on a reason NOT TO UPDATE. But once you did update, since you can install your hacks anyway using MRPI, that is no reason to go back - expecially because that's way more complicate than install new packages.

Indeed a reason could have been "It is evil because I cannot run/install app XYZ on fw 5.6.1", that was something I was expecting from OP. But then again, I was willing to know which hack, exactly, was not working in 5.6.1

You need to check the relative dates - -
The original of "5.6.1 is evil" predates MRPI -
In fact, 5.6.1 is what required the creation of MRPI.

Ruskie_it · 11-30-2014, 11:06 AM

Oh, I see.
Didn't know that MRPI was SO young...

knc1 · 11-30-2014, 11:09 AM

Quote:

Originally Posted by Ruskie_it

Oh, I see.
Didn't know that MRPI was SO young...

Its age is still counted in days.
If it wasn't for 5.6.1, it would probably still be sitting on NiLuJe's to-do list.

variousvirgil · 11-30-2014, 12:28 PM

@knc1: I compared the mmcblk0 dump and the uImage (both are from firm 5.6.1), and it turned out that the offset is 0x00041000, so "seek" is still 65

Can anyone else figure out the offset of other firm version?

NiLuJe · 11-30-2014, 12:40 PM

Actually, ixtab's instructions seem to agree with GM's getkernels script (at least on my Touch, I'll check on a PW2).

Beware of the blocksize! GM (and Amazon's tools, IIRC) uses a blocksize of 1024, while ixtab's instructions use 4096. Every offset *should* still be a multiple of 1024, but take that into account in your maths

.

EDIT (on a PW rnning 5.4.5.1):

Code:

dd if=/dev/mmcblk0 of=main_kernel.img bs=1024 skip=260 count=2370

(260/4 == 65, for other maths-impaired individuals like me

)

And the only difference between what getkernels dumps and what FW 5.4.5.1 bundles is a bunch of extra crap bytes at the end:

uImage:

Code:

002504f0  cc 04 25 00 00 00 00 00  00 00 00 00 00 00 00 00  |..%.............|
00250500  ff ff ff ff ff ff ff ff  ff ff ff ff ff ff ff ff  |................|
*
00260000

main_kernel.img:

Code:

002504f0  cc 04 25 00 00 00 00 00  00 00 00 00 00 00 00 00  |..%.............|
00250500  ff ff ff ff ff ff ff ff  ff ff ff ff ff ff ff ff  |................|
*
00250800

Code:

  File: ‘uImage’
  Size: 2490368         Blocks: 4864       IO Block: 4096   regular file
Device: fc02h/64514d    Inode: 2813702     Links: 1
Access: (0644/-rw-r--r--)  Uid: ( 1000/  niluje)   Gid: ( 1000/  niluje)
Access: 2014-08-12 00:00:11.000000000 +0200
Modify: 2014-08-05 14:01:33.000000000 +0200
Change: 2014-08-12 00:00:11.152355325 +0200
 Birth: -
  File: ‘main_kernel.img’
  Size: 2426880         Blocks: 4744       IO Block: 4096   regular file
Device: fc02h/64514d    Inode: 2821612     Links: 1
Access: (0644/-rw-r--r--)  Uid: ( 1000/  niluje)   Gid: ( 1000/  niluje)
Access: 2014-11-30 17:45:04.637692139 +0100
Modify: 2014-11-30 17:45:04.829689738 +0100
Change: 2014-11-30 17:45:04.829689738 +0100
 Birth: -

----

So, yup, I'd stay ixtab's instructions are still correct

. Did I get that right, @knc1?

variousvirgil · 11-30-2014, 12:49 PM

@NiLuJe : I have updated my last post and a stupid error has gone

so you can look at it again. It seems that the offset of uImage doesn't change (I think it is hardcoded), and I'll take a look at the partitioned data tomorrow.

NiLuJe · 11-30-2014, 12:53 PM

@variousvirgil: Gotcha

. My answer has also been updated, w/ a check on FW 5.4.5.1 that seems to indicate all is golden

.

shamanNS · 11-30-2014, 01:57 PM

[troll]I wonder if there is difference between 2GB PW2 and 4GB PW2

[/troll]

NiLuJe · 11-30-2014, 01:59 PM

@shamanNS: Which is why I checked on a 4GB PW2 ;o). (Speaking of: the RP is safe there too, something I wasn't convinced of before

).

knc1 · 11-30-2014, 04:13 PM

Quote:

Originally Posted by NiLuJe

Actually, ixtab's instructions seem to agree with GM's getkernels script (at least on my Touch, I'll check on a PW2).

Beware of the blocksize! GM (and Amazon's tools, IIRC) uses a blocksize of 1024, while ixtab's instructions use 4096. Every offset *should* still be a multiple of 1024, but take that into account in your maths

.

EDIT (on a PW rnning 5.4.5.1):

Code:

dd if=/dev/mmcblk0 of=main_kernel.img bs=1024 skip=260 count=2370

(260/4 == 65, for other maths-impaired individuals like me

)

And the only difference between what getkernels dumps and what FW 5.4.5.1 bundles is a bunch of extra crap bytes at the end:

uImage:

Code:

002504f0  cc 04 25 00 00 00 00 00  00 00 00 00 00 00 00 00  |..%.............|
00250500  ff ff ff ff ff ff ff ff  ff ff ff ff ff ff ff ff  |................|
*
00260000

main_kernel.img:

Code:

002504f0  cc 04 25 00 00 00 00 00  00 00 00 00 00 00 00 00  |..%.............|
00250500  ff ff ff ff ff ff ff ff  ff ff ff ff ff ff ff ff  |................|
*
00250800

Code:

  File: ‘uImage’
  Size: 2490368         Blocks: 4864       IO Block: 4096   regular file
Device: fc02h/64514d    Inode: 2813702     Links: 1
Access: (0644/-rw-r--r--)  Uid: ( 1000/  niluje)   Gid: ( 1000/  niluje)
Access: 2014-08-12 00:00:11.000000000 +0200
Modify: 2014-08-05 14:01:33.000000000 +0200
Change: 2014-08-12 00:00:11.152355325 +0200
 Birth: -
  File: ‘main_kernel.img’
  Size: 2426880         Blocks: 4744       IO Block: 4096   regular file
Device: fc02h/64514d    Inode: 2821612     Links: 1
Access: (0644/-rw-r--r--)  Uid: ( 1000/  niluje)   Gid: ( 1000/  niluje)
Access: 2014-11-30 17:45:04.637692139 +0100
Modify: 2014-11-30 17:45:04.829689738 +0100
Change: 2014-11-30 17:45:04.829689738 +0100
 Birth: -

----

So, yup, I'd stay ixtab's instructions are still correct

. Did I get that right, @knc1?

This is "below" the level of file systems, everything starts on an erase block boundary (4096 bytes).

PS: Those are not "crap bytes" - an erased flash device is "ones" not "zeros" like other storage media.

NiLuJe · 11-30-2014, 05:16 PM

@knc1: Ah, that explains that, thanks

.

ElRudi · 12-14-2014, 04:13 PM

Dear all,

Quick question if that's ok, as same happened to me. I too updated to 5.6.1 before updating JB, but in my case JB is at 1.10 and I don't have RP. The downgrade as described in https://www.mobileread.com/forums/sho...d.php?t=196245 wouldn't work, right? Any possibilities to downgrade in this case?

Thanks guys

GoSharks · 12-14-2014, 06:01 PM

Quote:

Originally Posted by ElRudi

Dear all,

Quick question if that's ok, as same happened to me. I too updated to 5.6.1 before updating JB, but in my case JB is at 1.10 and I don't have RP. The downgrade as described in https://www.mobileread.com/forums/sho...d.php?t=196245 wouldn't work, right? Any possibilities to downgrade in this case?

Thanks guys

Not yet... if your JB version is <1.13 and you have updated to 5.6.1 (whether on purpose or by silent OTA) you are stuck. (at least until a new JB method is developed...scuttlebutt says after the holidays)

ElRudi · 01-15-2015, 07:59 PM

Hey guys,

is anyone aware of progress on this front?

Thanks!

11-30-2014, 12:28 PM	#20
variousvirgil Junior Member Posts: 7 Karma: 10 Join Date: Nov 2014 Device: kpw2	@knc1: I compared the mmcblk0 dump and the uImage (both are from firm 5.6.1), and it turned out that the offset is 0x00041000, so "seek" is still 65 Can anyone else figure out the offset of other firm version? Last edited by variousvirgil; 11-30-2014 at 12:38 PM.

11-30-2014, 12:49 PM	#22
variousvirgil Junior Member Posts: 7 Karma: 10 Join Date: Nov 2014 Device: kpw2	@NiLuJe : I have updated my last post and a stupid error has gone so you can look at it again. It seems that the offset of uImage doesn't change (I think it is hardcoded), and I'll take a look at the partitioned data tomorrow. Last edited by variousvirgil; 11-30-2014 at 12:58 PM.

12-14-2014, 04:13 PM	#28
ElRudi Junior Member Posts: 6 Karma: 10 Join Date: Dec 2014 Device: KPW2	downgrade PW2 JB1.10 no RP Dear all, Quick question if that's ok, as same happened to me. I too updated to 5.6.1 before updating JB, but in my case JB is at 1.10 and I don't have RP. The downgrade as described in https://www.mobileread.com/forums/sho...d.php?t=196245 wouldn't work, right? Any possibilities to downgrade in this case? Thanks guys Last edited by ElRudi; 12-14-2014 at 04:28 PM.

01-15-2015, 07:59 PM	#30
ElRudi Junior Member Posts: 6 Karma: 10 Join Date: Dec 2014 Device: KPW2	progress? Hey guys, is anyone aware of progress on this front? Thanks!

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11-30-2014, 11:06 AM	#18
Ruskie_it Fanatic Posts: 538 Karma: 1000000 Join Date: Dec 2011 Location: Rome, Italy Device: Kindle PW5, Kindle PW4, Kindle 4 NT	Oh, I see. Didn't know that MRPI was SO young...

11-30-2014, 12:53 PM	#23
NiLuJe BLAM! Posts: 13,506 Karma: 26047202 Join Date: Jun 2010 Location: Paris, France Device: Kindle 2i, 3g, 4, 5w, PW, PW2, PW5; Kobo H2O, Forma, Elipsa, Sage, C2E	@variousvirgil: Gotcha . My answer has also been updated, w/ a check on FW 5.4.5.1 that seems to indicate all is golden .

11-30-2014, 01:57 PM	#24
shamanNS Wizard Posts: 1,138 Karma: 12345678 Join Date: Feb 2010 Location: Serbia Device: Kindle PW5, Kobo Libra 2, Kindle PW1	[troll]I wonder if there is difference between 2GB PW2 and 4GB PW2 [/troll]

11-30-2014, 01:59 PM	#25
NiLuJe BLAM! Posts: 13,506 Karma: 26047202 Join Date: Jun 2010 Location: Paris, France Device: Kindle 2i, 3g, 4, 5w, PW, PW2, PW5; Kobo H2O, Forma, Elipsa, Sage, C2E	@shamanNS: Which is why I checked on a 4GB PW2 ;o). (Speaking of: the RP is safe there too, something I wasn't convinced of before ).

11-30-2014, 05:16 PM	#27
NiLuJe BLAM! Posts: 13,506 Karma: 26047202 Join Date: Jun 2010 Location: Paris, France Device: Kindle 2i, 3g, 4, 5w, PW, PW2, PW5; Kobo H2O, Forma, Elipsa, Sage, C2E	@knc1: Ah, that explains that, thanks .

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