open the pc odin 1st and load the xxx.md5 THEN BARU CONNECT THE DEVICE..

no need to di factory reset since the rom is NON WIPE version..but if u do face FC then try to clear cache 1st at application..

some personal observation (compiled) after close to 24hrs of use (stock and non-rooted). new items in RED.:
installation:
* need to install via KIES. no OTA yet.
* the update % may slow down at certain times...
* does not wipe your data... but still, never know... can happen. so backup first.
* apps drawer arrangement all gone... have to re-arrange again.

after installation
* cannot disable shutter sound in camera apps
* new swype is nice -- but copy/ select all now requires use of shortcut keys
* seems to take up more RAM -- i know RAM should be used. previously, my RAM usage hovers around 500+... now 600+.
* nothing major. not sure if its just me... but i noticed i get more hang applications today after the update. will probably restart the phone again and see how.
* now got S Memo and S Note... haiz... can't Samsung integrate nicely... now i got two similar apps?!?
* new gmail client -- not so easy to switch between accounts... i guess need to get used to this new interface
* lots of interface change with Google applications, in fact... not just the GMail i mentioned. Reader, etc... all also got some changes.
* Reader Hub still sucks. The ebook reader... still dun have the dark/ night option... previously used to have.
* stock browser seems much faster...
* no new live wallpaper
* i guess i can now uninstall 3G watchdog... ICS has got its own Data Usage meter.
* battery meter can also show % now... yea!
* camera apps... when you launch... you have that annoying TIPS that might not go off... what i did was to try using the S PEN to check "do not show again" and then OK. sometimes might not work. when that happens, use task manager to kill task and try again.
* nice that there's now some guidelines on folders. i see more apps putting photos (within individual folders) into one common folder called Pictures.
* Screencaptures and now called Screenshots. new folders... new locations... new naming convention for the files. Samsung should not change format with each revision la... *sigh*
* battery seems to drain faster. unplugged from wall about 630am. drove to PJ. in between, it was some twitter and reader updates, 5 mins gaming... by about 740am... 90% battery left...
* keyboard hangs... on several occasions, i can't swype anything. had to go to settings and change keyboard before it worked again. not sure if its swype issue or generally the input/ keyboard integration issue.
* TouchWiz actually hung on me about 2-3 times already. basically homescreen will just freeze. can't swipe to other screens... HOME button will light up the screen. i can put phone display to sleep but after unlock (using pattern lock) and HOME screen is showing, it just won't respond. had to restart phone.

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Go to setting > Display > and at the bottom tick the Display Batt Percentage