You can update CID to 52 too. You gain more update firmware.
If you want keep all imode function you need a FS+CP k610i related firmware file. Else if you want debrand to original K610i phone your MAIN+FS are good but you must chose a custom pack generic for your language area (NOT K610im). HB1-06_Generic_CDA102568_4_R3A_GENERIC_MEDITERR is good
bye