Originally Posted by gpmartinson
If I put in stock recovery then I can flash this in fastboot mode? DO I need to extract it. I'd really like to get the radio from the update--I'm S on and have a custom ROM. DO I need to go back to stock? Feel free to use snark when you respond, but a legit answer plus snark is perfectly karmicly acceptable given my question. THanks.
You are S-On it means you cannot flash radio in it's own.
What you need to do is go back to stock ROM and stock recovery and wait for ota or if you cannot wait force stock recovery to flash ota from phone.