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Keep upgrading image file and checksum file in your created folder.
for For Ex:
Keep rdk-generic-camera-image_default_20200329074421.rootfs.rpi-sdimg and rdk-generic-camera-image_default_20200329074421.txt files in your tftphome folder.
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https://youtu.be/CZhsVBEMYuk3. Refer swupdate.log in /rdklogs/log/ direcotry.