In your case, your bloatware comes from the csc packages that your provider distributes. Note that without a csc, nps will not update your phone in the future so you either
1. you find an update from somewhere else.
2. reflash with csc just to update
3. try to emulate what installing the csc does without installing the whole package. (I know that the csc version can be shown in the about screen by copying the CSCVersion.txt to /system but I'm not sure if that's enough for nps to recognise your phone for updates. You'll need root to remount /system to copy the file over.)
By default a stock install comes with alarm clock, browser, calculator, calendar, camcorder, camera, contacts, dialer, email, gallery, google mail, google maps, google talk, market, messaging, music, settings, switchers, videos and youtube.
I've seen some reports that some recent factory installed firmwares come with the samsung keyboard which isn't in II5 yet. So if you want to keep the ime, you'll have to copy it out. I'll say just backup the whole os with nandroid just to be safe. You can always restore it if you realise you missed something.
Android is an OS like what Windows is to a PC. The bios is more like the baseband and comes in the amss file from an update. During an update, both the baseband and the os sections are updated.
Just to correct the previous post, the recovery isn't the bios but a stripped down android os that only provides a minimal set of tools to recover your default os from. Think of it like a safe mode of windows.
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