Use these files:

1. C902_R3EA038_MAIN_GENERIC_AS_RED52 (Downloads > Firmware > C902 > R3EA038_RED52)
2. C902_R3EA038_FS_WESTERN-EUROPE_RED52 (Downloads > Firmware > C902 > R3EA038_RED52)
3. C902_1208-6209_R4A_Customized_United_Kingdom (Downloads > Custom Files > c902custpack)

OR these files:

1. C902_R3EA038_MAIN_GENERIC_AO_RED52 (Downloads > Firmware > C902 > R3EA038_RED52)
2. C902_R3EA038_FS_WESTERN-EUROPE_RED52 (Downloads > Firmware > C902 > R3EA038_RED52)
3. C902_1208-6209_R4A_Customized_United_Kingdom (Downloads > Custom Files > c902custpack)

AO or AS version you can see when take photo and click Properties > Details:




After flashing with A2uploader -> update via SEUS to last version R3EG004.