you can flash your phone with this tutorial

Flash your phone and How to apply or remove patch using SETool 2 Lite - Top Sony Forums

and put a firmware with generic Main and a FS with your region, and the CDA must be the same region of the FS

something like this

W880_R6BC002_MAIN_GENERIC_AI_RED52
W880_R6BC002_FS_EUROPE_4_RED52
HB1-06_Gen_CDA102568_13_R8A_GENERIC_EUROPE_4