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You just need the 'firmware.bin' file on the root of an SD card.
The card should be 8gb or less and formatted FAT32.
Insert the card, power down the printer, and then turn the printer on again.
If you did it right, it will update and rename the file on the card to 'firmware.cur'

There many video guides, but the steps for flashing are the same. Try this one, but only for the instructions of flashing.

https://youtu.be/CN6dOI6QxAs?t=141

He is using files from BTT- Don't do that.
Just use the firmware.bin from here, and follow his instructions.

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