I've noticed that among several 9900 7.1.0.267 official release, and even the leaked version, that the file named rim0x07001204.sfi in the UMTS folder differ in size ( sometimes several MB ).
I've read somewhere that this is the main kernel of the OS. So, do I have to care about that file when choosing a 7.1 release since my provider doesnt provide a official release.
Or, do you suggest that I try the leaked release ? Is it a more "generic" version ?
It differs in size mainly due to the number of languages the OS supports. For example a MultiLanguage OS has a smaller sfi file than an AllLanguage OS.
A leaked sfi also contains no carrier bloatware, so it's usually smaller than an official one.
If you don't need the additional languages, then go for the leaked .267 which is a MultiLanguage build where the sfi is only 67MB.