KPW2 5.4.2.1 available!

[bnpssilva]

Thank you, Knc1.
You know a lot of this stuff !!!

But it still a shame, I really miss the multi dictionary lookup from older kindles.

[BrentB]

So I guess the cloud collections "issue" isn't resolved? I was hoping they would at least give us an on/off switch for using cloud collections. Guess I'll just have to keep the wifi off.

[lottloft]

In case anyone cares, I can confirm that the bridge does preserve the jailbreak. After the update, all I needed to do to get my screensavers back was install the linkss bin and Update my Kindle...screensavers are back.

[dsmid]

Originally Posted by ixtab

Nope. The upgrade button will remain grayed out if you are on 5.4.2.1 and try to install the "original" 5.4.2 .bin

I've done my homework, tried to force the update and got this:

   140224:104301 otaupd[2058]: I ota_lipc:startUpdateThread:battLevel=69:startUpdateScript
   140224:104301 otaupd[2058]: E ota_monitor:GetApplicableUpdateFailed:reason=noUpdatesAvailable:Trying to install null update_file object.
   140224:104301 otaupd[2058]: I ota_check:validateOTAHeader:status=starting:Starting OTA Check
   140224:104301 otaupd[2058]: E ota_check:validateOTAHeaderFailed:reason=updateSoftwareIsTooOld:
   140224:104301 otaupd[2058]: W ota_monitor:rescanOTAMonitorWarn:reason=validateOTAHeaderFailed:
   140224:104301 otaupd[2058]: I ota_monitor:getPatchRev:patchRev=0:
   140224:104301 otaupd[2058]: I url_builder:HandlerExists::Adding/Updating property to handler
   140224:104301 otaupd[2058]: E ota_monitor:GetApplicableUpdateFailed:reason=noUpdatesAvailable:Trying to install null update_file object.
   140224:104301 otaupd[2058]: W ota_monitor:InstallSystemUpdateRetryScanWarning:retryCount=1:Found invalid update, rescanning filesystem.
   140224:104301 otaupd[2058]: I ota_monitor:getPatchRev:patchRev=0:
   140224:104301 otaupd[2058]: I url_builder:HandlerExists::Adding/Updating property to handler
   140224:104301 otaupd[2058]: E ota_monitor:InstallSystemUpdateFailed:reason=invalidUpdateFound:Trying to install null update_file object.
   140224:104301 otaupd[2058]: E ota_lipc:StartUpdateFailed:reason=installUpdateFailed:Unable to install the system update.

The most interesting part is this: validateOTAHeaderFailed:reason=updateSoftwareIsTooOld
It seems to me Lab126 is trying to ban downgrading... I think it's quite rude.
Because if they come with an anti-jailbreak measure in the next firmware release, we're screwed.
The firmware version must be newly stored somewhere in the header, but I don't think it can be modified easily, if ever (because of the bundle signature).

Spoiler:

Fortunately, I was lucky to find a way how the firmware can still be downgraded in spite of this check, but I won't speak about this method in public. PM me if you are interested.

[NiLuJe]

@dsmid: Yep, the recovery v2 format includes the target OTA version in the header, and the header is part of the stuff that's signed.

[knc1]

Originally Posted by NiLuJe

@dsmid: Yep, the recovery v2 format includes the target OTA version in the header, and the header is part of the stuff that's signed.

Ah, but what about the information installed on the machine which is being compared against,
is it also signed?

Note: This question refers back to a suggestion of mine when this situation (or a similar one) came up - of lying to the OTA updater about the currently installed version.

[dsmid]

Originally Posted by knc1

lying to the OTA updater about the currently installed version.

Yeah, it's easy when you take over the device.
But what if the device is not even jailbroken ?

[knc1]

Originally Posted by dsmid

Yeah, it's easy when you take over the device.
But what if the device is not even jailbroken ?

Then I would have to say: NOP (Not Our Problem).

- - - -

Darn!
There I go, giving lab126 lessons again.

[dsmid]

I am not that convinced Amazon won't put some effort into plugging the hole.

My problem is that I am making extensions for complete illiterates - people that don't even understand English text in Kindle menus and dialogs (grandmas and such).
The more complicated the installation is, the more emails from desperate people will land in my inbox.
When Amazon disables jailbreaking or makes it very difficult, all the effort put into my project will become useless.
It's as simple as that.

[dsmid]

Originally Posted by knc1

There I go, giving lab126 lessons again.

Delete your post before it's too late!

[knc1]

Originally Posted by dsmid

Delete your post before it's too late!

Done.