you need to unroot your device before applying updates
official updates required stock recovery
if you rooted your device your recovery will changed to a custom recovery
if you install the updates on rooted devices
either they turn off and open in bootloader mode
or may device got hard brick
1st unroot your device
clear davlik cache
then apply your updates
First let me thank you for the gracious help mate.
As i said i'm very new at this, i'm glad i asked the experts before going all noobacrazy on the phone.
I have recently purchased this phone from a guy ( open market ), and i fond this ''kingo root'' app installed '' that's how i figured it was rooted, besides the authentification error message, i can't check my imei using #*06# ( i don't know what this means ), the only thing i fond on the internet is how to mount a lollipop sprint ROM using cyanogenmode ! ( not sure how to do it exactly ) but i can follow the instructions and hope for the best i guess.
as for stock recovery i'm afraid that :
1st/ i have no idea what i'm supposed or how to do it.
2nd/ if i succeed it would become network locked,, ( it happened to me with an S2 once )
3rd/ The professional repairer in my city , to which i took my phone, said it was risky to go ....well hard brick as you said
Sorry for the long poste , again thank you !!! and thank you so much for any further info you can give me.
the lollipop seeker