i have g550t1 and yes it boots fine and no there was no LTE issue at all. What i meant was i tried flashing the sound fix which broke LTE. Not a surprise as it was written for a diff phone. Just tried it out and restored.
Another thing is at one point i got grace ux working with sound but it was with the first version that OP posted on youtube which has a link that is down.
The way i got it to work was restoring his backup and then installing czarstuperstar's rom over it. Like a dirty flash over it.
I tried this today with the second version of OP's rom which is different from his newest graceux/dreamux mix. It booted up fine and sound even worked but it was very buggy.
Have not tried this method with his newest but i did install it for a while today and it works like a charm minus all sound even call sound.
BTW it was you that commented on sanjuboy's youtube and encouraged him to make this thread right? Thanks for that btw
P.S
@sanjuboy have you found any method for getting sound to work on g550t1? Any ideas? I saw a youtube video in another language with a link to a replacement other.xml to be used for fixing bugs in your rom. I tried replacing it and then i deleted another css file that it told me to in the video but it didnt do anything. Also tried installing xposed over your new rom and it caused a bootloop. Does xposed work on it in g550fy? i noticed that root worked fine for me.