Me and my friend we both have Lumia 720 he already got the Lumia cyan update on his phone but I can't is it because I downloaded the preview for developer version? If it is how can I get the Lumia cyan update on my phone now?
Yes, due to some BitLocker issues, the Cyan update for people on the Developer Preview was halted, but it seems to be slowly starting up again. So, you have two options, which is A) revert your phone back to Windows Phone 8 via the Nokia Software Recovery Tool (do a search on it, I'm not quite sure the steps, but this DOES erase EVERYTHING on your phone) or B) just wait a bit longer.
The choice is yours.