Help with mi a1 stuck on lte after qxdm - Xiaomi Mi A1 Questions & Answers

Hello everyone , i really need your help.
After trying to enable 4g+ on my xiaomi mi a1 i am left with an awkard situation. All i did in qxdm was changing the value of rfnv lte b3 ca cb config ..but being stupid at that moment i forgot to write down the default one .
On slot 2 ...everything is ok .
On Slot 1 ...i have 4g ..i can send and receive sms , i have internet connection but i cannot make calls .
On *#*#4636#*#* the voice network type is set to LTE, and it doesnt change from 4g to 3g when trying to make a call. And since my network ( vodafone romania) doesnt have voice over lte i cannot make calls from slot 1 .
If i try to change the network type from 4g to 3g ..i lose signal .
Any help would really be helpful .Thank you in advance.

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