I have an issue trying to run FLDIGI with My Yaesu FT-991a. Everything I read says i need drivers to make it work but best i can find is this driver [https://www.silabs.com/products/development-tools/software/usb-to-uart-bridge-vcp-drivers ][1]

Its for Linux so I assume it will be compatible for Rasbian

I have read a lot about installing drivers in rasbian but all of it is specific to whatever driver the discussion is about. Having a hard time trying for figure out the command line I would need to do this. Seems that as this is a newer radio there is very little direct instruction and it all involves either windows or mac. Would like to figure it out so i can pass it a long to others in the Ham community. Do a lot of emergency communications and this would be a perfect setup if I could get it to work.

1 Answer 1


Always good to see a fellow ham radio operator here on StackExchange! Assuming you're logged-in at the base of your home directory (we'll use username 'pi' for the sake of this answer)

First we'll download and extract the file:

  1. On your Raspberry Pi, download this Linux_3.x.x_4.x.x_VCP_Driver_Source.zip (we'll assume it goes into your ~/Downloads folder).
  2. From a terminal window, type:

    mkdir drivers

(you can call this anything, I named it drivers, adjust accordingly downstream)

  1. Type:

    mv ~/Downloads/Linux_3.x.x_4.x.x_VCP_Driver_Source.zip ./drivers/

  2. cd ./drivers

  3. At the command line type:

    unzip 3.x.x_4.x.x_VCP_Driver_Source.zip

  4. For some reason Silicon Labs put a compressed file within a compressed file. So we need to extract/decompress one more time:

    tar -xvzf Linux_3.x.x_4.x.x_VCP_Driver_Source.tar.gz

  5. Make your cp210x driver by typing:


  6. Copy the driver to the correct location:

    cp cp210x.ko to /lib/modules/4.9.80-v7+/kernel/drivers/usb/serial/ OR cp cp210x.ko to /lib/modules/4.9.80+/kernel/drivers/usb/serial/

  7. Insert the module into the kernel

    insmod /lib/modules/4.9.80-v7+/kernel/drivers/usb/serial/usbserial.ko OR insmod /lib/modules/4.9.80+/kernel/drivers/usb/serial/usbserial.ko

  8. Install the driver:

    insmod cp210x.ko

  9. Reboot

    sudo reboot

73 and Good Luck! K6JEB

  • after trying to extract .tar getting this: pi@raspberrypi:/drivers $ tar -xvzf Linux_3.x.x_4.x.x_VCP_Driver_Source.tar.gz tar (child): Linux_3.x.x_4.x.x_VCP_Driver_Source.tar.gz: Cannot open: No such file or directory tar (child): Error is not recoverable: exiting now tar: Child returned status 2 tar: Error is not recoverable: exiting now any ideas why i getting this? Regards, Kes. Mar 25, 2019 at 19:24

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