2. Using SD with update.img in it for Linux BSP

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How to do about update form SD card?

Step1 Create the OTA update.img using source code， see more details in build section.

Step2 Copy to the SD.

Step3 Insert the SD to RSB4810.

Step4 Enter "update-ota" in Terminal or debug console.

Step5 Device will enter recovery mode and auto upgrade.

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