0.Flash WhatsApp Working Aosp-miui rom
1.First install WhatsApp another WhatsApp working rom
2.Install Data Backup this app
3. Flash My ROM
4. Restore WhatsApp..
5. Reboot
6. Done

Credits:
PaperOS team(icluded rom) && Kashi for Launcher && xiaomi.eu
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Test Version
First paperos port in fog
Fixed dpi issues
Fixed bootanimation
Fixed many more bugs
I'm lazy say to...