Format the SD card, Direct the extraction to the SD card and name it something different. you need to have it off when you insert the card, power it on , follow prompts.

You need to take the file out of the folder. Every time you flash the printer with the same firmware, you need to rename it. For example you can rename it firmware1.bin, then firmware2.bin, etc.

Pull out just theEnder3V3SE_firmware.bin file from the directory. Place it in the root directoryof the SD card. rename it firmware.bin. Make sure you have View-->Show-->Filename extensions turned on first so you don't make it firmware.bin.bin :) Then insert it and turn on the printer and wait, the UI does suck, but it will finish after some time, I think it wsa 15 minutes or so.

You have to open the file folder. The machine cant read a closed file. The individual files need to be in the root directory.