How to flash stock rom firmware on samsung galaxy s duos gt-s7562 step 1: to get started, download samsung galaxy s duos gt-s7562 usb driver and install it in your computer. once done, download the stock firmware of your device and extract the zip file to get the “ .tar.md5 ” file as shown below.. Here’s what you need to download the official samsung gt-s7562 firmware (stock rom) flash file onto your computer. download the samsung gt-s7562 stock firmware package from the links above directly to the computer. extract the file by right-clicking on it and choosing the option to extract. when you do, you’ll see the tar.md5 file inside.. Install stock rom on samsung galaxy s duos [gt-s7562] download the rom as your country :d flash stock rom on samsung galaxy s duos [gt-s7562]. Custom rom pmp™ ultra v8.5 for samsung galaxy s duo...