![]() ![]() Wait about 1 seconds before releasing the metal tweezers. Plug in the micro USB cable to the board to power on. ![]() Use a male to male USB cable to connect your host PC and USB OTG port of the board:įind the reserved eMMC CLK and GND pads on the board, as shown below:Ĭonnect the eMMC CLK and GND pads with metal tweezers and keep holding steadily. Install the eMMC and pull out the SD card. Pull all the USB cables (including micro USB cable and male to male USB cable) out of the board, to keep the board power off. Metal tweezers to connect eMMC clock pin to ground.Male to male USB cable to connect host PC and board.Micro USB cable to connect power adapter and board.It involves hardware operation to force into MaskRom Mode, which has certain risk and should be carried out VERY CAREFULLY. The CPU will execute a small ROM code, waiting for the host to upload via USB a small DDR blob to initialize the DDR memory, and later a full bootloader to handle further firmware upgrading. Then no valid IDB (IDentity Block) will be found in the eMMC. eMMC read data failed by connecting eMMC data/clock pin to ground.If anyone of the following conditions is met when the board powers on:
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