Your PlutoSDR can be fooled into thinking the chip is the AD9364 which gives an expanded frequency range of 70MHz to 6GHz [Link]
You can also enable the second CPU core, although it is not known if this improves performance.
Connect with a terminal emulator (for example Putty) to the Pluto serial port.
After the reboot login again and cat /proc/cpuinfo shows two CPUs - processors 0 and 1
And example of the output from these commands is availabe here [Link].