1) Format the SD CARD.
2) place the romdata folder with .FWU folders in it and place it in the sd card slot in the device.
3) If there are updated firmware already present in the device,it will inform and there is no other way as your updating process could need correction.
4) As long as you are following the first 3 steps do not worry about any other folders present for firmware upgrade it will work. Please see the pic attached in my case.
Thank you for reading.
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