Wrong ROM flashed? 86047 is correct ROM and NOT 88047
1. Search a tutorial to fix your network signal with NON-HLOS.bin
2. Install a Fastboot-ROM with Mi Flash
Now your device is working correctly
3. Install TWRP
4. Install your favorite ROM
Your ROM version was correct?
I had problems with camera too and my problem was wrong ROM 88047.
Correct is for 2014813 --> xiaomi.eu_multi_wt86047_****.zip