i really need help...only ModMyi.com i can trust...yesterday i istall siri on my iphone 4 6.1.2 ...then i cant use that app..after that i follow the guide to make siri funtion in my device..after i follow the guide..the guide says to edit plist in ifile var/system/library/launchdaemons/com.apple.springboard.plist.....

<string>/System/Library/CoreServices/SpringBoard.app/SpringBoard(SOMETHING WRONG IN HERE)</string>

when i finish edit this plist..my device wont turn on till now...stuck in apple logo..many tips n guide i follow but same...i follow some wrong sources n hacker..but them wont give me a answer..i really hope ModMyi.com can help me..i loss the original plist n dont know how to fix all this..many web browser i find to this..but all i cant trust anymore...n i hope my device can fix without a reset all data..becoz my power button cant be used...i really hope i receive a right answer..ty