I have Xperia S (LT26i). Earlier it had 6.2.B.0.211 installed.
I flashed it with "XperiaS_LT26i_6.2.B.1.96_1257-6919.ftf", flashing was successful, but after I started my phone I saw this message "SIM network unlock PIN". What should I do now?
(Click the image to enlarge it)