If that's all you wanted, why root? With rooting comes a level of responsibility to maintain your phone on your own. You should know what you're getting in to before you root. You should always have a stock backup before you root or remove system apps. You have to have all the original stuff in order to update.. I have a stock mg5 backup, I'll find the link for you. Just restore it in twrp just like your own backup. Then Flash (install) the no props mg5 to nd4 update. I'll get that link for you as well.
Edit: I responded to another one of your many posts about this. If the directions in that thread are too complicated for you there's not much I can do.
http://androidforums.com/showthread.php?p=6649278
Edit 2: here is stock mg5 backup.
https://drive.google.com/folder/d/0B7FbX6-171skeDN1ZnNEaEp2MnM/edit
Put it in the folder- twrp/backups/"serial number"/ then restore it like it was your own in twrp. In twrp choose restore then choose this backup file then swipe restore.
Edit 3 : then download the update here
http://link.tapatalk.com/api/click?...RP.zip&subId=50907a3f9889b7ea9ce755f67a05fb37
Install the update in twrp. Then you will be updated. Now remember before you modify your system or go deleting system apps, make a backup in twrp. Always have a way back. Remember that there may be updates some day and if you don't know how to modify an updater script to install in custom recovery, there may be problems for you. Do your homework first and you can save yourself a lot of headaches.
Rooting isn't for everyone. In your other post you said you know nothing about any of this and don't want to, that you hate android, hate this phone, maybe rooting isn't your thing. Remember we are all fans of android here, and with comments like that it may be hard to get help in the future. We all get frustrated with this stuff sometimes, take a breath, the answer might be closer than you think sometimes. Sorry if that got a little preachy but, bro, it was REAL hard to want to help you with all those comments, posts, assaulting all the victory threads. Best advice I can give if you plan to keep this phone, unroot it and stay stock. And don't get so frustrated about it, remember its just a phone.