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maemo.org - Talk (https://talk.maemo.org/index.php)
-   Nokia N9 / N950 (https://talk.maemo.org/forumdisplay.php?f=51)
-   -   Firmware downgrade from 1.3 to 1.2 possible (https://talk.maemo.org/showthread.php?t=88091)

rainisto 2012-12-02 18:05
Re: Firmware downgrade from 1.3 to 1.2 possible
 
Quote:
Originally Posted by vitaminj (Post 1300698)
Perhaps people might want an email client which shows unread counts reliably or a web browser which doesn't aggravatingly blank the address bar when it fails to load a page, two major regressions in what was supposed to be a bugfix release.
but that doesn't require you to downgrade, if you want to run some older versions of applications, you can just extract the binaries from older firmwares, and use inception or other exploits to install them over the new binaries in PR1.3.

Jordi 2012-12-02 18:26
Re: Firmware downgrade from 1.3 to 1.2 possible
 
A reason to downgrade in Pr 1.2: to have a usable autocorrection for French :(
Fortunately, we have the Swype keyboard but it's a sad situation.

pali 2012-12-02 22:26
Re: Firmware downgrade from 1.3 to 1.2 possible
 
Quote:
Originally Posted by rainisto (Post 1300551)
b) you use software downgrade exploit (which is not publicly available)
exploit for usb flasher?
bug in x-loader?
bug in nolo?
or somehow on device via inception?

Makeclick 2012-12-03 03:58
Re: Firmware downgrade from 1.3 to 1.2 possible
 
Quote:
Originally Posted by rainisto (Post 1300551)
Not possible is the default answer for marcaurell.

However it is possible if:
a) you have R&D certificate in your device (which only Nokia employees have)
b) you use software downgrade exploit (which is not publicly available)
It's not even possible in the Nokia factory :D, so i don't think, it will never happened. Been there done that... I think there could be some software to do so, but it's only available for Maemo/Meego team.

rlinfati 2012-12-03 05:08
Re: Firmware downgrade from 1.3 to 1.2 possible
 
Quote:
Originally Posted by pali (Post 1300781)
exploit for usb flasher?
bug in x-loader?
bug in nolo?
or somehow on device via inception?
design problem :)

you need be in normal mode (not open mode) and clean/erase the cert-sw..., and you can downgrade the APE side (not the CMT side)

http://mg.pov.lt/harmattan-irclog/%2...03-23T22:15:27

:)

pali 2012-12-03 08:07
Re: Firmware downgrade from 1.3 to 1.2 possible
 
Ok, so what is stored in CAL key "cert-sw"?

eljonker 2012-12-03 17:08
Re: Firmware downgrade from 1.3 to 1.2 possible
 
Quote:
you need be in normal mode (not open mode) and clean/erase the cert-sw..., and you can downgrade the APE side (not the CMT side)
Can you share the guide to do that?

pali 2012-12-03 17:21
Re: Firmware downgrade from 1.3 to 1.2 possible
 
In normal mode you have read&write access to CAL. So I think downgrade can be done with writing some old cert to CAL, then rebooting & flashing old version of fiasco.

rlinfati 2012-12-04 03:42
Re: Firmware downgrade from 1.3 to 1.2 possible
 
Quote:
Originally Posted by pali (Post 1301046)
In normal mode you have read&write access to CAL. So I think downgrade can be done with writing some old cert to CAL, then rebooting & flashing old version of fiasco.
or write NULL using cal_write_block(...)

eljonker 2012-12-04 17:05
Re: Firmware downgrade from 1.3 to 1.2 possible
 
I have Dev environment, but I have not libcal-dev and I am not so experienced with C. Do you have binary of cal_write_block?


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