TCL S850 Error after upgrading to 4.2 via ota

[fede_8]

HI,
The phone boots fine, but jumping Application Error, "Unfortunately, (App Name) has stopped".
I am not allowed to do anything, because all the time that message appears.
I can not enter debug mode.
The phone was root. and installed gapps.
The problem is that now I can not do root, that does not enter debug mode.
I think the root, I install the gapps for 4.2.
thanks