Download a modified version of TWRP custom recovery v3.0.3 for OnePlus 3 and OnePlus 3T device. This recovery has been modified by Blu Spark adding full compatibility to the device. Developed originally by Team Win Developers team, this is a really good stock recovery replacement for many Android devices including OnePlus 3/3T.
Now you can grab it from our special direct hot link that supports resume-able multiple connections. The file is in .img extension which can be easily flashed through ADB command prompt interface. Therefore, you will need to firstly install either OnePlus ADB Driver or Minimal ADB and Fastboot Drivers into your computer. The driver software is essential to be firstly installed or otherwise your Windows 10/8 computer will not be able to recognize your phone.