CDMA signal disappear after changing network using an app

My phone is a replicate of the Huawei P8 called p8 lt Dual sim Android 6.01. After I used an app called Network Mode Universal to enable LTE on my phone, the signal disappear and I can't use my CDMA SIM anymore. At first, all I did was change the mode to LTE only. Then I tried other options, but nothing works. Other than that, GSM seems to work fine. > > I tried restarting my phone, resetting my network, and using another CDMA card but nothing works. How I can reset my configuration?