I am trying to install FreeBSD 11 from USB using memstick.img file but during installation process I'm getting error about it can't find usb device and mountroot > is appearing. What should I do ?
You can check by typing
? what rootfs candidates there are. If you don't find you USB drive, it is better to choose other ways to install FreeBSD. Typically USB drives are named
For example, burn a CD or DVD image and install from that. Other option is to try other USB ports (yes, seriously). Most PCs and laptops have more than 1 USB controller and it might be more compatible.
You can also try to modify USB settings in your BIOS. Sometimes there are some compatibility/legacy settings that you can switch on or off.