Hello and welcome to Android Forums mpshah
Sorry to hear that you're having problems. Lets see if we can sort you out...
Originally Posted by mpshah
So here's the thing, I have a unlocked Samsung S4 I9505 (international version) and everything was working well till yesterday. I wasn't happy with the Touchwiz so when I saw the GE ROM I gladly downloaded it, rooted the S4 and installed the ROM. All was good till now, then I got adventurous and tried to install the Omega ROM V 7.0 and thats when the problems started. After installing this ROM, the phone never passed through the boot logo of Omega.
Fearing that the phone was bricked, I went ahead flashed the stock firmware using ODIN thinking it would take the phone back to stock firmware. But I was wrong, everything on ODIN went OK but this time the phone got stuck ast the Samsung Boot logo. I've flashed the stock firmware at least 5-6 times with multiple battery pulls but to no avail. I can't even get in to stock recovery which is the frustrating part.
So guys could you help me out here please?
Oh, dear... you have become, "Flash Happy". This is the state whereby you flash anything and everything on your phone in the hope of getting it working.
The term, "bricked", is reserved for the inability to even turn the phone on and usually indicates a fried motherboard which is a very expensive repair job.
Your original problem between the flashing of the 2 custom ROM's probably occurred because you did not wipe the cache partition and dalvik cache in Recovery mode and had all the detritus from one ROM cache in the new ROM cache. The problem was further increased when you then flashed the stock firmware.
However, now that you have flashed a stock firmware, (hopefully the correct one for your model of phone), your options are a little more limited as you now have the stock kernel and recovery.
I would suggest biting the bullet and doing a Factory reset whilst booted into Recovery mode by pressing and holding the following buttons... Volume Up +Home (centre hard key) + (lastly) Power. Continue to hold these buttons until your phone boots into the Recovery screen. This will wipe all data on your phone but not the firmware that you have flashed. You will need to sign in to your Google account and re-sync afterwards.
For future reference... always do a nandroid, Titanium and efs file backups after rooting in case of such problems. See post #3 of the Rooting Galaxy S4 - Dummies Guide