Did the OP ever get this to work?
I've tried everything so far, and nothing will work. I've tried everything multiple times and I haven't had any luck.

Can someone please make a video on how to change the carrier name?
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Did the OP ever get this to work?

Did you get "recovery error (Status 0):" in cwm?
When that happens you need to grab the update-binary file
from your ROM and paste in the zip file.
1. Unzip your ROM and find
META-INF/com/google/android/update-binary file
2. Put this file in the UOT zip (overriding UOT's file)
A while ago I PM'd someone on this forum, and they responded with this. This worked, however it only changed the carrier name in the Settings>About Phone>Status area, and left the status bar and lockscreen area's both blank. The method you're referring to on XDA left my phone in a boot loop.
This is what the person I PM'd said to do.
"Ok you have to have a deodexed rom and apk tool, or apk manager and you decompile framework-res.apk. you can't just open it with 7zip or you wont see the values folder. So after you decompile the apk it will let you access values folder that's in the res folder that's in the framework-res folder that apk tool created. Example path ( framework-res/res/values) and in the values folder there's a file called strings.xml open it up with notepad++ and go to line 1048 and replace boost mobile with whatever you want. Then recompile framework-res and the recompiled apk will be inside a folder named dist that's inside the framework-res folder. Now open up the original framework-res.apk with 7zip and then open the new framework-res.apk with 7zip also you should now have the two apk files opened up side by side with 7zip now you have to delete the res folder and resources.arsc file that are in the original apk and then copy the new res folder and resources.arsc from the new framework-res.apk to the original one you can now use the original apk and it should work. You can push the original back into the system with adb or root explorer. Or you can use the original apk to make a uot theme and it will flash it back for you."