I updated on OTA while I had root, and now I get "no command" after the google logo. I have stock recovery and a locked bootloader, and formatting is not an option. Any help?
Hi and welcome to AndroidCentral. You will need to flash the stock ROM from Google's site, which will indeed wipe the data from the device as you need to unlock the bootloader first.
In the future, do not attempt to do any OTA updates on a rooted device.