I am using an X310. Recently, I upgraded both gnuradio and uhd versions.
For gnuradio, running gnuradio-config-info -v returns 33110293.
The most recent change number listed in the UHD changelog is 3.9.2
I recently upgraded the firmware version from 9 to 20 using:
uhd_image_loader --args="[type,address]" --fpga-path="[path]/usrp_x310_fpga_HGS.bit"
After burning the image I decided to run uhd_rx_cfile to make sure everything still worked: