What you will need to flash the board is: You can always flash the rock, it never bricks (as the name :)) unless some hardware damage occurs. You can download the prebuilt images from our server or build your own images. You can choose to either flash the whole nand image (ie, update.img) to the board or just flash the selected partitions. This page describes how to install an image to the nand flash of Radxa Rock, ie, how to flash the board. 3.4.2 What's verision of My board and Which Image should I flash!.3.1.1 Flash all-in-one nand/emmc image file(Recommended).2.3.1 FlashTool can not recognize the board.