Do not rush into the flashing process. Prepare the following items to avoid a permanent brick.
Need help? Post your error log and screenshot below. Official Wiko Rainbow 3G Stock Rom For SP-Flashtool
Once downloaded, extract the ZIP. Look inside the folder. If you see an MP_xxx folder structure with a .pac file, that is for a different flasher (Wiko's proprietary tool). Do not use that with SP Flash Tool. You need the .img files. Do not rush into the flashing process