Can I remove my custom recovery? I'm in a weird predicament with my Nexus 5. I rooted easily when I first got it then 5.1 was rolling out and I really wanted to upgrade and did, then I was able to reapply the root access but didn't really use anything required root access enough to care. Now my OTA is ready for 5.1.1 so I clicked install (when the notification popped up) and it went into the recovery bit which is the twrp mod and cuts of the rest of the install process. I think. Can i remove twrp without losing my phones data and apply this update or is there an easier work around perhaps? My boot loader is also unlocked, I just really can't be bothered to flash a new ROM (although cataclysm looks fun) and then sort out all my apps and settings again.
Download the 5.1 factory image, Then extract the tgz, you will find a zip file, copy recovery.img to the same directory that have the fastboot file

Reboot to bootloader and connect to PC then open terminal or cmd 'Windows' and type that:

fastboot flash recovery recovery.img

then enter, then wait to finish and now everything is good!