1. First of all download the required files here.
BLU Vivo 6 users please download below attached Scatter File and use this instead of those available in zip.
2. Install all required drivers.
3. Extract All Zips.
4. Run the "SP Flash Tool" as admin (Right Click on the file and click on run as admin)
5. Select "Scatter Loader" from the provided zip, and check that only recovery must be selected.
6. Select "Download Only".
7. Power off the cell phone but don't attach with data cable at this stage.
8. Now click on "Download" and press volume down button and attach cell phone.
9. Wait till flash. You are done.
In case you got scatter file error download the ROM attached and flash it by selecting Firmware update in flash tool.
Root & Encryption Issue
1. Download the Magisk Root files from here.
2. Copy the files in Memory card and not into Internal Storage
3. Boot into "Recovery" by 'Turning Off" the cell phone, now press "Volume Up" and press "Power Button", it will show three options, select "Recovery" by pressing ":Volume Up" and select it by pressing "Volume Down".
4. Swipe to allow modifications.
5. When you first boot into recovery it will ask you for the password, press "Cancel" button and install "Magisk Root", after that press "Wipe" and select "Factory Reset" and then "Wipe Data".
6. Now flash Magisk from memory card. You can select it from "select storage" button and select memory card. otherwise memory card will not be accessible from other menu.
7. Now reboot your cell phone.
Hit Like if it helped you.