Ok fellows Thx Gastric for that and give creidt to him/her....
1st) All u have to do is to donwload ur new core (look steph corner or other sites)
2nd) Upload ur core wherever u want
3rd) Find ur old wow server folder
4th) copy the files ascent.conf logon.conf and realms
5th) Paste it on ur new core and run game!!!
Work fines with me
P.S Dont flame me about this thread.... Thank you
P.S All credits to Gastric
P.S Hope it help u a bit:P