Need help fixing system problems after downloading Lollipop 5.0 upgrade for Note 3 today
I found some people who suggested wiping cache data instead of factory reset.  Did that just now and it's working great, with no loss of data!


Power off.
Power on in recovery mode (this is for the Note 3) by holding down the power, home and volume up buttons until the screen flickers.   I got red messagesaying Booting to Recovery partition or something like that... you get a list of items. 
Select Wipe Cache Partition using the volume buttons to move up or down. Power button to select.   It took maybe 5 seceonds to wipe the cache.
Select Reboot.


And my phone is back!