Your android device is acting up and you've tried all you can to get it up and running but nothing seems to work and you cant even gain access to the factory reset option, and it seems there's nothing more you can do, Then you should try to the hard reset option or recovery mode. There's no one fixed way of getting into the recovery mode it all depends on the manufacturer of your device. However, there are are several options you can try to get you into the recovery mode of your android device.

HOW TO ENTER RECOVERY MODE ON ANDROID​

Make sure to power off the device then try the following:

1. Press and hold the power button and the volume buttons (up and down together)
2. Press and hold the power button and the Volume DOWN button together
3. Press and hold the power button and the Volume UP button together
4. Press and hold the Home button, power button and the Volume UP button together
5. Press and hold the Home button, power button and the Volume DOWN button together

one of these combinations will take you into the recovery mode, if you are using a Chinese phone then what you will most likely see will be the image below:

find out more here: https://techsolutionsng.com/threads/how-to-hard-reset-an-android-phone-with-chinese-recovery-menu.36/

continued:
This can be very daunting at first considering the fact that most of us don't understand Chinese language but you can use the legend below as a guide:
(the legend can be located on the attached picture)

Using the Volume buttons you can navigate Up and Down the Menu. To hard reset your device use the volume down button and move to item number 7 and then use your power button to select it, when the process is done you then use the Volume down button and and move to Item number 9. The system will now reboot to its original factory default.

Hopefully, that should take care of your issue.

techsolutionsng:
Your android device is acting up and you've tried all you can to get it up and running but nothing seems to work and you cant even gain access to the factory reset option, and it seems there's nothing more you can do, Then you should try to the hard reset option or recovery mode. There's no one fixed way of getting into the recovery mode it all depends on the manufacturer of your device. However, there are are several options you can try to get you into the recovery mode of your android device.

HOW TO ENTER RECOVERY MODE ON ANDROID​

Make sure to power off the device then try the following:

1. Press and hold the power button and the volume buttons (up and down together)
2. Press and hold the power button and the Volume DOWN button together
3. Press and hold the power button and the Volume UP button together
4. Press and hold the Home button, power button and the Volume UP button together
5. Press and hold the Home button, power button and the Volume DOWN button together

one of these combinations will take you into the recovery mode, if you are using a Chinese phone then what you will most likely see will be the image below:

find out more here: https://techsolutionsng.com/threads/how-to-hard-reset-an-android-phone-with-chinese-recovery-menu.36/

https://gadgetsright.com/factory-reset-samsung-galaxy-s6

There is one thing I want to pass across to the reader of this post, factory reset samsung galaxy S6, will sure be the best option if your device are not functioning well. The issue about this is that, so many users find it hard to format their phone due to the fear of losing what they have on the phone.

Doing a regular factory reset samsung galaxy S6 Edge + will not only help keep your device running smoothly, it can also be the only thing saving you from an unusable phone when something bad happens.

Another great reason for factory reset samsung galaxy S6 edge+ is to get a fresh start on the smartphone. No matter the reason, we will vividly be teaching you how to factory reset samsung galaxy S6 edge plus.

NB
Doing a factory reset will wipe all your data from your phone, so make sure you have backed up of all your important data (information), preferably in more than one place before you will proceed.

How to back up your data before factory reset samsung galaxy S6

From Settings > Backup and Reset, tick all the boxes, and install a reliable Android backup app. It is not a bad idea to manually copy your photos, music and documents over to your computer with a USB cable as well. Just in case.

How to Factory reset samsung galaxy S6: settings menu

1. Turn on the Galaxy S6 by pressing the power button
2. Once you get to the Home Screen, navigate to the Menu and then move to the Settings option.
3. Select Backup & reset and then reset your device, to remind you once again, you must back up your data in other to save and secure them.
4. To confirm your choice select erase everything to wipe away every data on the phone. Now you can see that this method is very simple, if you need to factory reset Samsung galaxy S6, then just try this method.
https://gadgetsright.com

I got that here: https://droidfeats.com/how-to-restore-reset-a-mobile-having-a-chinese-recovery/