If you've tried updating your version of CyanogenMod lately and have been having some trouble, here's the most likely solution. If you've tried flashing firmware and got a Status 7 error and had no idea what that means, it means that your bootloader needs to be updated for the firmware to take hold. You may also need to update your radio. Here's how to do both on the Nexus 5.
(This is a preview - click here to read the entire entry.)