Read here: http://www.topsony.com/forum/far-manager-f31/flash-k800-cid53-k810-software-cid53-begginers-t11605.html#post89845 and use these files:
EUROPE_4 -> English - Finnish - Danish - Icelandic - Swedish - Norwegian
K800_R8BF003_MAIN_GENERIC_WI_RED53
K800_R8BF003_FS_EUROPE_4_RED53
HB1-06_Generic_CDA102568_13_R4A_GENERIC_EUROPE_4