libusb couldn't open USB device /dev/bus/usb/002/006: Permission denied. libusb requires write access to USB device nodes

Question

I am connecting my FTDI Device with Laptop USB. I was following all the steps given in the link How to build libftdi git under Linux

But after installing.. When I was running ./eeprom it is throwing:

Unable to open device -1: (libusb_open() failed)ftdi_read_eeprom: -2 (USB device unavailable)

I installed FTDI D2XX driver from link:

D2XX for Linux

After installing, I was trying some examples to write in USB EEPROM.

$sudo ./write

It is throwing:

libusb couldn't open USB device /dev/bus/usb/002/006: Permission denied.
libusb requires write access to USB device nodes

I was setting

cat /etc/udev/rules.d/85-ftdi.rules
SYSFS{idVendor}=="0403", SYSFS{idProduct}=="6001", MODE="660", GROUP="ftdi-user"

Then also, it is not working. Same error is coming.

Solution

SYSFS was deprecated in favor of ATTR/ATTRS. See hotplug/udev.git

Try with:

ATTRS{idVendor}=="0403", ATTRS{idProduct}=="6001", MODE="660", GROUP="ftdi-user"