Uninstall latest update?

[Hopewell]

My Galaxy S5 updated to version G900vvru2dqf2 this morning.
Now one of my apps is not working correctly, it will not connect via bluetooth.
Is there a way to uninstall or to reinstall the previous software so I can confirm if it is this latest software that is causing my problems?

 

[Jfalls63]

Usually a good practice to do a Cache partition wipe in recovery after a system update.
From off, hold the power, home and volume up till phone starts to boot then release the power button only. Release all buttons when you see the recovery menu.
Use volume down to scroll down to Wipe Cache partition and press the power button to select it. After wipe is complete, restart.
Will not delete any user data

 

[PitCarver]

Took mine a while to stabilize, after the update...

 

[Hopewell]

My Galaxy S5 is still not working with my Square credit card reader via bluetooth.
This is apparently a known problem since the last software update on the S5 and several other Samsung devices.
Any help from Samsung or Verizon or how to roll back to previous software would be appreciated.