1. Download the below files: - Mtk USB Driver here - Sp Flash Tool   here or here - A1 Firmware here  2. Install mtk USB Drive...

Files to be downloaded: - Susan M5 4G LTE flash file here or here . - SPD Upgrade Tool here or here . - USB Drivers here .

  Step 1:  Make sure your Samsung B5510 is turned off by holding down the power button.