ota for metro is done by calling *228xx then selecting to update your roaming capabilities.it changes your prl back one from the stone age,lmao@update your roaming capabilities,they should change that.
so depending on how you used evasi0n you have 2 choices,open cydia and go to manage/packages and see if your evasi0n package is there,if it is just uninstal it and then use the tool to load your prl,then back to cydia to reinstall your untether and your done,or if you don't see it there it is unpacked and you will have to search it in funbox and remove the unpacked files that way which may cause instability and even crash so you may have to restore,or you could just restore.