Baseband downgraded but iphone not working

[1fix]

Hello Modmyi user,
Hope you can help me. recently i downgraded bootloader 5.8 baseband from 5.11.7 with fuzzyband then unlocked it with ultra snow.
problem are follows:
1. Iphone os 3.1.2 am using. wifi keep dropping off even 10 meter it does not appear on the phone, if i take the phone near router it work wifi with strong signal wifi ( i have two iphone both 3.1.2 upgraded 8 GB and 16 GB .16 GB wifi perfect can;t downgrade bb 5.11.7 bl 5.9

2. iphone 8g after downgrade call become problem. i can hear the caller voice they can;t hear me.

both wifi and call incoming voice is the problem please help. I went apple support tried all method still not working also jail broken many times.

Thank you in advance
1fix

[haissk]

try Resetting your Network settings