need help about mt6572 bricked phone

Hello friends this is my first thread (sorry for my english)

I want to install Stock rom for my Mt6572 phone (android 4.2 - 4gb - 512 ram - POSH Pegasus 3g ).

I have a Stock ROM and sp flash tool and the computer (sp flash tools ) recogn the phone as Mediatek preload USB.

When i try to DOWNLOAD , appears BROM DRAM FAILED 4032
When i tray to FORMAT ALL + FLASH ---> BROM DRAM FAILED 4032
When i try to TEST RAM ---> BROM DRAM FAILED 4032
Finally when I connect another phone (i have 3 POSH Pegasus 3g phones ) then NO ERROR, all OK.

I think that the problem is the phone, and Not SPFlashTool or STOCK ROM
I think that is a NAND corrupt or EMMC corrupt, that stop de DOWNLOAD and appear BROM DRAM FAILED warning

If any can help me to repair this problem for Download the ROM. I apreciate your help. Thanks