= How to Unbrick a USRP =

== N210 ==
Do this if the USRP becomes unresponsive to normal commands and cannot be found with uhd_find_devices. 

'''DO NOT DO THIS ON GRID OR WITH ANY OTHER USRP CONNECTED TO THE NODE!!!

1. Load {{{baseline_uhd.ndz}}} onto a node with an extra ethernet card

2. Boot up the node

3. Download the latest firmware/UHD images to the node:
{{{
uhd_images_downloader
}}}

4. Configure eth2 to be able to talk to the USRP
{{{
ifconfig eth2 192.168.10.1 netmask 255.255.255.0
}}}

5. Remove lid of USRP

6. Connect the USRP's ethernet to the node

7. Put USRP in safe-mode:
  a. Hold down the S2 button in the middle of the USRP's motherboard while power-cycling the USRP
  b. Keep holding until the D & F status LED lights are stable and the left LED on the ethernet jack is green

8. Check if the node can see the USRP:
{{{
uhd_find_devices
}}}
  If not, retry step 7

9. Burn new firmware and FPGA images to the USRP:

  ''Normal image:''
{{{
usrp_n2xx_simple_net_burner --fw="/usr/share/uhd/images/usrp_n210_fw.bin" --fpga="/usr/share/uhd/images/usrp_n210_r4_fpga.bin" --dont-check-rev
}}}
  Do NOT reboot the USRP when asked.

  ''Safe image:''
{{{
usrp_n2xx_simple_net_burner --fw="/usr/share/uhd/images/usrp_n210_fw.bin" --fpga="/usr/share/uhd/images/usrp_n210_r4_fpga.bin" --dont-check-rev --overwrite-safe
}}}
  Allow the USRP to reboot when asked.

10. Check if the node can see the USRP:
{{{
uhd_find_devices
}}}
  If not, manually power-cycle the USRP back into safe-mode again and proceed to step 11.
  
  If the USRP shows up, proceed to step 14.

11. Write new default ip into EEPROM:
{{{
/usr/lib/uhd/utils/usrp_burn_mb_eeprom --values="ip-addr=192.168.10.2"
}}}

12. Reboot the USRP into regular mode by just power-cycling it (do not hold down the S2 button)

13. Check if the node can see the USRP:
{{{
uhd_find_devices
}}}

14. Test image loading (all steps should report "successful"):
{{{
uhd_image_loader --args="type=usrp2,addr=192.168.10.2"
}}}

15. Check if everything shows up correctly (versions, daughter-boards, etc):
{{{
uhd_usrp_probe
}}}