FAIZAN

Hello everyone I have avic f60bt and avh-x8690bt I guess in both of system my interal sd cards are corrupted can anyone help to explain step by step how to copy it as I'm noob in this never tried it before...one of my friend is also having same model i removed his internal sd card and tried to boot my system it booted correctly so can anyone explain how to copy it or install new file on sd card ....tried several test mode file dont know how to boot in test mode i downloaded the test mode file do we have to copy the entire test mode folder om root of sd or only the files which are there i