求救, ip4 ios 5.1.1 jb 咗restore唔到..

事源就係個whatsapp update咗之後用唔到, 咁我嘗試restore前一晚嘅backup, 發覺個whatsapp都係已經update咗, 就唯有jb再裝返舊版whatsapp, 點知一駁電腦又sync咗個whatsapp又用唔到, 好啦咁我喺app sync度untick個whatsapp, 點知部ip個app直頭無咗, 我裝返舊whatsapp啦, 點知當咗新app裝, d history又無晒, 好啦咁唯有restore啦又, 點知restore唔到, sync到app但所有apps嘅history無晒, 有無巴打有咁嘅經驗?!