how to unlock screen of samsung s6 Desperate to sort this out, before i do a factory reset!
Samsung Service Centre useless, said factory reset is the only option....

Had fingerprint set to lock samsung s6, don't remember ever setting a backup password - screen literally locked as i passed the phone to someone.
managed to access phone signing in on google.  then phone requested i set up another fingerprint lock, which i did.  also put a password in, which i remember.  password not being recognised.
phone locked again.


tried all combinations of all passwords i have, but no luck unlocking phone.
findmysamsung, android device manager not letting me access phone/reset lock (perhaps because remote control not enabled)?
unable to install bypass lock app as it's saying app is not compatible.
unable to use adb
tried installing 3rd party apps to unlock screen but they don't work


any suggestions on how to unlock the phone (or do a data back up before i factory reset) would be great - i am desperate to keep my data!
Figuring out whether you can go all the way and bypass your lock screen will depend on the outcome of the steps below.

Following this guide,


Skip the step of turning on USB Debugging, you can't get past the lockscreen.
Download Odin, and the TWRP .tar file
Boot your phone to download mode, then plug it in to your computer, let the drivers install. Open the Odin.exe on your computer, fiddle with the USB connection until Odin says "COM1/2/3/4: Connected!"
Put the TWRP .tar file in the correct textbox, uncheck Auto-Reboot
Flash!
When it says finished, you can reboot your phone. However! You need to boot it directly into recovery mode, otherwise TWRP gets overridden past the Samsung logo.
Once you're in TWRP, congrats! Make a FULL backup onto an SD card or USB drive with OTG adapter.


Now to bypass your lockscreen:


Flash the SuperSU .zip found in the guide.
When you boot into TWRP does your computer recognize the phone in Device Manager? Does it make a bloop sound? You should find a device called "ADB".
Download the ADB kit from here (and the drivers if you can't get your computer to install them) and call adb.exe from a command prompt.
Run adb devices. If you see a long 50-character ID pop up, you're in luck!
If there's no ID, try another computer, it took me 5 computers to recognize.
Go into adb shell type su hit enter.
If it says permission denied, you're out of luck.
Run rm /data/system/gesture.key then rm /data/system/password.key
If no errors, profit!
If permission denied, remount system RW: mount -o rw,remount /system If that fails, try mount -o rw,remount /proc /system (a little hack I came across) and try step 8 again.