Backing up the existing firmware from a working phone. Essential Download Links
: Proper installation of Coolsand/RDA USB drivers is critical. These drivers allow the operating system to communicate with the hardware in boot mode. coolsand rda flash tool link
Most Coolsand/RDA devices require a specific "boot key" to be recognized by these tools: Power off the phone. (or sometimes the center/OK button). Backing up the existing firmware from a working phone
Insert link: https://www.mediafire.com/file/………/Coolsand_RDA_Flash_Tool.zip coolsand rda flash tool link
Important safety notes (read first)