I successful found the X300 on my network. The probe command returned that the FGPA was 35, but got 13. I followed the procedure to reflash. That worked but now I have a residual DDC error from probe command: PS C:\Program Files\UHD\bin> .\uhd_usrp_probe.exe --args addr=192.168.10.2 [INFO] [UHD] Win32; Microsoft Visual C++ version 14.1; Boost_106600; UHD_3.13.0.0-0-gf114cfa0 [INFO] [X300] X300 initialization sequence... [INFO] [X300] Maximum frame size: 1472 bytes. [INFO] [X300] Radio 1x clock: 200 MHz [INFO] [GPS] No GPSDO found [WARNING] [UDP] The MTU (1472) is larger than the FastSendDatagramThreshold (1024)! This will negatively affect the transmit performance. See the transport application notes for more detail. [INFO] [0/DmaFIFO_0] Initializing block control (NOC ID: 0xF1F0D00000000000) [INFO] [0/DmaFIFO_0] BIST passed (Throughput: 1307 MB/s) [INFO] [0/DmaFIFO_0] BIST passed (Throughput: 1317 MB/s) [INFO] [0/Radio_0] Initializing block control (NOC ID: 0x12AD100000000001) [INFO] [0/Radio_1] Initializing block control (NOC ID: 0x12AD100000000001) [INFO] [0/DDC_0] Initializing block control (NOC ID: 0xDDC0000000000000) [ERROR] [DDC] Major compat number mismatch for DDC: Expecting 2, got 1. Error: RuntimeError: FPGA component `DDC' is revision 1 and UHD supports revision 2. Please either upgrade the FPGA image (recommended) or downgrade UHD. I have so far found no mention of this problem anywhere. Jay