After installing CUCO92 13S US verion - no mobile data

I I'm facing the issue that I have no data connection after flashing CUOCO 13S US for the LeTv One Pro. Even when I configure manually my APN from T-Mobile germany. I also tried to activate Band 20 with * # * # 9439 # * # * and check mark the CDMA Box. Rebooted already and also tried to clear Cache and Dalvik. I get only GSM connection. I setup the phone via WLAN and noticed this morning that the phone is not able to get mobile data connection.
Any ideas how to fix it ? Flash again maybe ? Does anyone has the same experience ?

Thanks !

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