You must use JDflasher. Read here how to use JDflasher here: http://www.topsony.com/forum/far-manager-f31/flash-k800-cid53-k810-software-cid53-begginers-t11605-mensaje89845.html#post89845

and these files:

W610_R6BC002_MAIN_GENERIC_NA_RED53
W610_R6BC002_FS_BALTIC_RED53
HB1-06_Gen_CDA102568_1_R8A_GENERIC_BALTIC

Main and FS download from: Downloads > Firmware > W610 > RED53 > R6BC002_RED53
Custom file: Downloads > Custom Files > w610custpack