Does this help?
https://kb.ettus.com/Building_and_Installing_the_USRP_Open-Source_Toolchain_(UHD_and_GNU_Radio)_on_Linux#Configuring_USB

On Wed, Sep 11, 2019 at 1:08 PM Javier Uranga via USRP-users <
[email protected]> wrote:

> Dear Members in the List,
>
> I'm working with an old USRP B100 that came with a cubesat development
>  kit,
>
> Now suddenly stop working, no longer respond to:
>
> uhd_find_devices
> linux; GNU C++ version 5.3.1 20151219; Boost_105800;
> UHD_003.009.002-⁠0-⁠unknown
> No UHD Devices Found
>
> uhd_usrp_probe
> linux; GNU C++ version 5.3.1 20151219; Boost_105800;
> UHD_003.009.002-⁠0-⁠unknown
> Error: LookupError: KeyError: No devices found for -⁠-⁠-⁠-⁠-⁠>
> Empty Device Address
>
> I must to say that, until few minutes before, the device showed no
> problems, but after a switch OFF/ON the device, problems came up
>
> And when I ask:
>
> $lsusb
> the device found is:
> Bus 003 Device 003: ID 04b4:8613 Cypress Semiconductor Corp. CY7C68013
> EZ-⁠USB FX2 USB 2.0 Development Kit
>
> As you can see, the detected device is not longer Ettus USRP as use to be.
> More over, in the front panel, new led is on, there is a new led in ON
> status, the LED B: FPGA loaded
> (in addition to:
> LED A: transmitting,    ON
> LED C: receiving,          ON
> LED D: FPGA loaded,   OFF
> LED E: reference lock, ON
> LED F: board power,     ON )
>
> I already re installed the GNU RADIO 3.7.9 drivers for Ubuntu 16.04 and
> GNU RADIO 3.7.11 for Ubuntu 18.04, all systems where it use to work, But
> the USRP is no longer detected.
>
> drivers in Ubuntu 16.04:
> /usr/share/uhd/images$ ls
> usrp_b100_fw.ihx
> usrp_b100_fpga.bin
>
> What can be wrong ?, it's Firmware problem ?
> How can I solve it?
>
> I'll be very grateful with any comments or suggestions
>
> Best Regards,
> Javier Nicolas
> _______________________________________________
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> [email protected]
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>
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