You can use this 3 files and do full flash (this is newest firmware for your phone):
MAIN: W810_R4EA031_MAIN_GENERIC_HN_RED49
FS: W810_R4EA031_FS_EUROPE_2_RED49 and
CUSTPACK: W810_CDA102555_11_R2A_Generic_EUROPE_2
For flashing use this tutorial - XS++ 3.1 Guide-Flashing, Customizing, Recovering - Top Sony Forums or
Flash your phone using SETool 2 Lite - Top Sony Forums
For unlocking use this tutorial - part 1 - for DB2010 Remove SIM-lock patch generator - Top Sony Forums