I recently brought a tmobile unlocked, Samsung galaxy s3, T999.
I tried to upgrade firmware with samsung keis, but it stucked at 0.
Then I tried, Emergency Firmware Recovery, it also got stuck.
I rooted it and applied a custom rom, CyanogenWIZ(Found on xda top review rom)
Then i wasnt able to turn on wifi, SIM not detected, etc.
Then I wiped all data, reset the phone.
It didnt goto the home screen, stuck at loading(with that google 4 colord dots).
I could ONLY access, Recovery Mode and Download mode properly.
Finally was able to reinstall the stock rom,
Galaxy S3 Stock Firmware | Galaxy S3 Root
T-Mobile Galaxy S3 Stock Firmware MD5
After that, It loaded all those "Android 4G tMobile logo, Samsung Galaxy S3, that green animation"
But it didnt go further than SAMSUNG logo with blue animation thing.
I installed the,
[Stock][ROM]Galaxy S3-LTE (d2ltetmo) - xda-developers
First, Recovery, then Stock Kernel.
Now, IT says,
"Firmware upgrade encountered as issue. Please select recovery mode in Kies & try again."
When I press the turn ON button.
Cant access recovery mode. But download mode can be accessed.
PLEASE HELP ME< I REALLY NEED YOUR HELP.