You will need to provide the access to wpa_supplicant.config for backup and restore to wifi connection and try the following in order to solve this problem. It may help you out.
Code:
mkdir /system/etc/wifi 0770 wifi wifi
chmod 0777 /system/etc/wifi
chmod 0661 /system/etc/wifi/wpa_supplicant.config
chown wifi connection/system/etc/wifi/wpa_supplicant.config
mkdir /data/misc/wifi 0770 wifi wifi
mkdir /data/misc/wifi/sockets 0770 wifi wifi46 chmod 0770 /data/misc/wifi connection
chmod 0661/data/misc/wifi/wpa_supplicant.conf
# Used by wifi.c wpa_ctrl_open
mkdir /data/system/wpa_supplicant 0777 wifi connection
chmod 0777 /data/system/wpa_supplicant
chown wifi wifi /data/system/wpa_supplicant
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