I looked at your tutorial it mentions all kinds of carriers but not US Cel. That was what made me wary. According to your tutorial all i have to do is find a Custom US Cel ROM and
to flash a custom rom from a stock rom
1. unlock your phone using hardspl found here:
https://www.wckediden.com/show...titan+unlocker
2. download the custom rom of your choice and download
3. take the nbh file and drag into the RUU folder found here:
https://www.wckediden.com/show...ghlight=RUU%2A
4. connect to activesync
5. run the romupdateutility.exe file from the RUU
6. follow the steps of the wizard.
7. DONE.|