Default [Q] nand flash was not detacted

help pls i bricked my phone after i flashed i wrong rom with sp flash tool well i tried to flash many roms from needrom.com but with no success i get this error BROM ERROR : S_FT_ENABLE_DRAM_FAIL (4032) or some times an error saying NAND flash was not found or EMMC was not found, when i run memory test it say NAND flash was not detacted the same with EMMC test too , and before my phone was bricked my computer was detecting it as " MTK preloader usb vcom" and now "MTK usb vcom" i think that because i flashed a wrong preloader , any way , i have the same phone is working fine alps GT-I9500 mtk6572 the same modele as the bricked one i buy them from the same place , i did a rom back up for the working with MTKdroid tool tried to flash it and nothing , plz help me dont know what to do