atmega32u4 customer board device manager doesn't recognise

• atmega32u4 customer board device manager doesn't recognise
  Posted by Harmony on 21 Feb, 2019 06:51
• I have built a ATMega32u4-AU custom board (8Mhz Ceramic Resonators, 3.3V), after set the fuse: Fuse High Byte: 1001 1001 (0x99) Fuse Low Byte: 0101 1110 (0x5E) Extended Fuse Byte: 1111 0011 (0XF3), and downloaded bootloader to the chip, the device manager still shows "Unknown USB device", I cannot find which step I did wrong, please kindly point out. Many thanks.
  

  ---

  
• #1 Reply
  Posted by up8051 on 21 Feb, 2019 09:56
• Set Fuse-Bits as below.
  lowFuse  0xFF     , highFuse 0xD9      ,extendedFuse 0xC3
• #2 Reply
  Posted by jackthomson41 on 22 Feb, 2019 15:17
• Did you upload Arduino bootloader in Atmega32
• #3 Reply
  Posted by Sarcarean on 27 Feb, 2019 10:10
• "Unknown USB device" usually means the base driver is loaded. Try and load the Atmel FLIP driver or the generic LIBUSB driver.