OP3 factory reset:
https://www.androidsage.com/2017/03/22/restore-to-stock-oneplus-3-3t-with-latest-oxygen-os-firmware-complete-unroot/
OP3 Recovery Image:
http://oxygenos.oneplus.net.s3.amazonaws.com/recovery_op3.img
Fastboot Ubuntu:
https://blog.droidzone.in/2017/10/16/install-adb-and-fastboot-for-oneplus-3/
Custom TWRP Recovery:
https://twrp.me/oneplus/oneplusthree.html
