I pulled the patched radio.img from my phone after updating to JDQ39 using the otaupdate provided by oldblue and El Madhatter. This file should work coming from any radio as it includes the full radio.img, not just the radio.img.p that is in the update from google. .
It must be flashed through a custom recovery, I do not think fastboot will not work for the LTE radio. The CDMA radio takes awhile, just as it did during the update performed in bootloader.
It flashed fine on my phone, but I'm not responsible for any problems you may have :P.
Thanks to El Madhatter for posting the google link to the update and oldblue910 for the link to the OTA update from google's servers.
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