Actually it is a DB2010 CID49 phone(K310@W200), :D but it will work with W200 for sure. When I made this tutorial I hadn't any DB2012 phone at hand...What phone were you flashing ? A W200i CID53 ?
Use R4JB001 CID52 firmware.How do I flash it to R4JB001 or R4HA014 ? Would R4HA014 CID52 do ?
How to flash the MAIN: open far manager, Alt+F1 select just da flasher. Then select the db2012(or the w200) script, and click on jump down... button. Enter to oflash, and copy the MAIN to it(to oflash folder). Don't forget to exit oflash(click on .. )!