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ginegerbread with serendipity

kk i have followed this video on youtube
‪Samsung Captivate (How To Install Gingerbread ROM's)‬‏ - YouTube

i had a at&t 2.1 eclair and upgraded to gingerbread.
i am at the step where i have to install a rom, can i use this rom
‪Samsung Captivate ROM's in a Flash (Serendipity 7) *June 3rd 2011*‬‏ - YouTube
or show me a better rom

can i just know put the phone in recovery in cwm go to mount usb and drag the zip file of this rom,

also the new 2.2 and 2.3 dont have the unkwown sources feature so how do i put my games that i download from internet onto the phone.
also can i get a rooting tool for 2.3

i have samsung captivate which is not rooted at the moment.
 

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