Firmware not found during an update can have various causes.

1. Have you put the files directly on the stick or in a folder?
You must put all files directly in the root of the stick, not in a folder.

2. If you look at the files on the stick you see for example FIRMWARE.BIN or maybe you see FIRMWARE (2) .BIN
In the last example, your PC / Mac has downloaded the file multiple times and your browser automatically places an extension after it.
Remove the extension so that it really has FIRMWARE.BIN (this applies to all 3 files)

3. Problems with the USB stick, format your usb stick and try again.

Format USB stick with Windows

To format a USB stick, proceed as follows:

  • Select Open Computer / My Computer / This PC via the start button (depending on your Windows version). You will see the connected drives in this window.
  • Click with the right mouse button on the USB stick that you have connected and will use.
  • Then click Format.
  • The window will then open with the title of the drive letter indicating which disk will be formatted.
  • Choose FAT or FAT 32 as the file format if the capacity of the stick exceeds 2 GB.
  • Check the box next to Quick Format
  • Press start.