maemo.org - Talk - View Single Post - New N9 64GB, took me long enough ;)

minimos	2013-06-25 , 05:39
Posts: 646 \| Thanked: 1,124 times \| Joined on Jul 2010 @ Espoo, Finland	#31

Originally Posted by jalyst

Makes sense, any rationale for the different Fw/eMMC image sizes between different variants that I noted?

It's probably small bits & bobs placed to please this and that opertor. Probably best way would be to get the tools to make an image and use them to open those .bin and compare them

Also, can you point to something that explains exactly why it's absolutely impossible to flash from [e.g.] PR_299 -> PR_235?

Do you remember what kind of error it throws in that case? Is is a 'security error' or a 'downgrade disallowed'?
The flashing verification is like: if (version1 > version2) and (swcert1 > swcert2) and (time_of_day > swcert1) and (other tests) then flash_version1 else exit_with_error
If that verification fails the only way to allow 'downgrade' is to use a rd certificate, but that has been available only in devices used internally in Nokia for testing.

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