You will cost nothing to re-flash the phone, with no need to reboot it in recovery mode.
Other features of the app Flashify is the ability to backup the current kernel and recovery that are stored on the internal memory or on the memory card. If you have insufficient memory, you can store data in the cloud storage Dropbox.
Features:
Firmware kernel and recovery without rebooting into recovery
Firmware zip, clean cache and Dalvik cache (firmware zip works on ANY device with custom recovery)
Backup and restore kernel and recovery are stored in the phone memory or in the Dropbox
Automatic sync with multiple devices with Dropbox
Firmware multiple files at once.