I had the same issues after flashing rom.
I solved them in this way:
I hope you have unlocked bootloader and TWRP recovery installed. If not, you should do it. Then make backup of your efs partition in twrp.
Then download the file https: //drive. google. com/ open?id= 0BzFxTDPkbNXVUDI3RDA4NHZWZEU (Remove blanks in url)
and unzip it into backup folder (smth.like sdcard/TWRP/BACKUPS/xxxxxxx/2017-03-29-11-22-3/) with replacing your efs files. After that restore backup with TWRP and reboot.
If it doesn't work, try to do this way: https: // xiaomifirmware.com/ guides-and-tips/ fix-missing-network-issue-redmi-4/
(Remove blanks in url)
I solved them in this way:
I hope you have unlocked bootloader and TWRP recovery installed. If not, you should do it. Then make backup of your efs partition in twrp.
Then download the file https: //drive. google. com/ open?id= 0BzFxTDPkbNXVUDI3RDA4NHZWZEU (Remove blanks in url)
and unzip it into backup folder (smth.like sdcard/TWRP/BACKUPS/xxxxxxx/2017-03-29-11-22-3/) with replacing your efs files. After that restore backup with TWRP and reboot.
If it doesn't work, try to do this way: https: // xiaomifirmware.com/ guides-and-tips/ fix-missing-network-issue-redmi-4/
(Remove blanks in url)