This file is indexed.

/usr/share/Nuand/bladeRF/firmware.txt is in libbladerf1 0.2016.01~rc1-3.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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BladeRF fx3 firmware and fpga configuration files
are expected to be in this directory by default.

Install the bladerf-firmware-fx3 package and
at least one of bladerf-fpga-hostedx40 or bladerf-fpga-hostedx115
packages, as appropriate for your hardware.

Or, run `bladeRF-install-firmware` from the bladerf package.