How to Install Android 6.0 Beta on Galaxy S6 and S6 Edge?

Step 1:Download and install Samsung Galaxy USB drivers to your PC
Step 2:Enable USB debugging on Samsung GalaxyS6 SM-G920F.To enable, simply go to settings >> Developers option, and enable from there. If the developers option isn’t visible, then go to About Phone under settings, and scroll down to Build number, then tap up to 7 times, till you get a message saying you’re now a developer. Now, go back to settings >> developers option and enable USB debugging.
Step 3:After that, download Samsung Galaxy S6 or Galaxy S6 Edge BTU firmware from the links provided above and extract the zip folder to desktop screen of your computer. Step
4:After that, Boot your Galaxy S6 SM-G920F or Galaxy S6 Edge into Download Mode. To perform the operation, you have to power off your device and then press, Volume Down + Power + Home. Press Volume Up now to continue to Download Mode.
Step 5:Once your device is in download mode, simply connect the phone to your PC via the use of USB cable and theODIN applicationwould notify an added message. You should see a blue box on the ODIN screen if all drivers are installed properly, if not, re-install and reboot PC.
Step 6:After that, chooseAPin Odin and select the firmware file with .tar.md5 extension in which you have downloaded. Also endeavor that the re-partition is not ticked in the odin. Also note that,AP stands for PDA,BL stands for BootloaderandCP stands for Modem.
Step 7:Finally, click on the start button, and the process would begin immediately. Once the process is completed, you would notice the RESET or PASS message on the ODIN screen. Then your device would boot into recovery mode, and the device would be restarted automatically.
Step 8:You’re almost done, simply download the Galaxy Care APK application from the link provided above and install on your device. Launch the app, and tap “Join” to follow-up on the beta-program, and then tap on the registration button, which after 24hours you’ll be provided with the beta marshmallow firmware via software updates. That’s it… download the firmware and upgrade to beat marshmallow firmware…
feel free to ask any related question via the comment section.