Debranding W995 TOTAL NEWBIE

[senter]

i did not use any custom file :S u didnt tell me to xD
is this something serious and i have to re-flash it?

Flash again with these files:

..but what happens if i get it for a service? will they found out by this that i flashed my phone?

Do not worry! You must tell them - otherwise how will understand.
Upgrading via SEUS is equivalen of flashing.