Adding my troubleshooting experience, as I did not find it mentioned anywhere:
Libusb couldn’t open USB device /dev/bus/usb/002/017
device: Samsung Galaxy S7
pc with Manjaro Linux and Easy-installer installed via the software manager
Easyinstaller was displaying below error and the logs were showing this
libusb couldn't open USB device /dev/bus/usb/002/017, errno=13
Exit value 1
Eventually, I found out that the installation of Heimdall was a pre-requisite, because after installing Heimdall (no need to open the program or do anything else other than install) the Easy-installer passed the step successfully. Heimdall is a Samsung proprietary tool that is conveniently available in Manjaro software manager:
