Senior Member has comeup with the procedure to root BLU R1 HD mobile phone.
Please proceed further with caution…
Download this file, flash the included recovery that Antonio made with the included scatter file Bullet made. Make sure you are using the latest SP Flash Tools V. 1628. Please note this is only for the Prime variant, the vanilla variant recovery will be coming soon. MrMazak will probably post about that.
Also note this was only tested on the 16gb variant of the Prime Phone. We are not sure if this will work on the 8gb variant. Flash at your own risk!
Extract the contents of the zip I posted to the same directory. They must be in the same directory to work. Turn off your R1 and unplug it from your PC.
To flash with SP Flash Tools, simply open the tool, load the scatter file you got from the zip, and a check box should be next to the recovery section of the flashing screen. Make sure flashing is set to Download Only, and click Download. Make sure your R1 is completely off, and plug it in to your computer. After a second or so it will start flashing.
Read Full Process at – Thread