Samsung Galaxy Tab S 10.5

Ahhh, yes....
I'll add info here
This is a great tablet, still the best Super AMOLED screen of its size I've ever used.

Details

• Circa: 2014
• Model: SM-T800 ( aka chagallwifi )
• CPU: Samsung Exynos5420
  • Octa-core:
  • 4 x Cortex-A15 @ 1.9 GHz
  • 4 x Cortex-A7 @ 1.3 GHz
• RAM: 3GB
• Internal Storage: 16 GiB
• Display
  • Native Resolution: 2560 x 1600 pixels (~286 PPI pixel density -- Nice)
  • Default DPI: 320
  • My favorite DPI: 220

Controls

• Recovery: With the device powered off, hold Home + Volume Up + Power.
• Download: With the device powered off, hold Home + Volume Down + Power.

Operations

Reset Password

Forgot your password? If you've got TWRP installed and your device is NOT encrypted, you can bypass the lock screen with the following: Credit goes to adithyan25 at SSS XDA Developers' forum

• Turn the device off
• Boot into recovery mode (XXX)
• Perform a TWRP Backup,just in case something goes wrong
• Use the TWRP terminal (or file manager if you must) to rename the following files:
  • /data/system/password.key
  • /data/system/pattern.key
  • /data/system/locksettings.db
  • /data/system/locksettings.db-shm
  • /data/system/locksettings.db-wal
    I just appended .old and that worked for me.
• Reboot into the normal system
• The lock screen should now only require a swipe, no pattern or password

Customizing

• Root with: CF-AUTO Root
• Recovery Tools
  • TWRM
  • TWRP for chagalllte
• ROMs
  • LineageOS - The build for this device is no longer maintained; but it is still available for manual build.