How to Root unrootable SpreadTrum SC6820

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http://forums.androidcentral.com – Model - Callbar A1 Android - 2.3.5 Kernal Version – Software version – 2.3.001.P1.12065 Hardware version – P1 CPU – SC6820 (1 Ghz.) Screen – 3.5” HVGA I tried several methods such as DoomLord, SuperOneClick, UnlockRoot, Z4Root to root the phone but none worked. Tried ADB to manually root the phone through commands but almost every command returns – “Permission Denied” or “Read Only System”. However files su, SuperUsr.apk, BusyBox were easily pushed into /data/local/tmp. Further steps like making local.prop and onwards could not be executed and returned a (HowTos)