Download Wiko Slide 2 official firmware from the link here, and follow the provided flashing instructions to learn how to flash the stock rom.
If you notice that any of the links provided below is broken or doesn’t work, please post in comments section so we fix and update it ASAP
Download Options
File Name: SLIDE2_DU_V20.zip
Size: 940 MB
Version: v20 (Lollipop)
Firmware – Download