Yes do a format of the SD card first. If you are any good with computers you can download red lite and find a RAZR m sbf file and it will get you back to ICS. Its pretty easy for someone who is a competent computer user. Also there are very good tutorials. Its up to you.
Edit wow I skipped a whole page!! But if you still want ICS rsdlite still is an option. And the ota update will still be available.