Tested on Vivo X170 xshot kitkat
Root
Downgrade to PD1302F_EX_A_3.7.0-update-full.zip
root it using kingroot
TWRP
Download vivo_xshot_recovery bine.rar
and flash it using rashr/flashify
Custom ROM
Download MIUI V7 (5.10.12)
in Stock ROM we can’t install xposed so wee need to install Cusrom
FLash it using TWRP
Xposed
After change ROM to MIUI