https://www.androidblog.gs/how-to-install-xxu2bqi1-android-7-0-nougat-on-galaxy-tab-s2-sm-t813/

https://www.sammobile.com/firmwares/galaxy-tab-s2/SM-T813/
http://www.droidviews.com/download-odin-tool-for-samsung-galaxy-devices-all-versions/
http://technastic.com/download-usb-drivers-for-android-devices-from-major-oems/