Exact same thing happened to my K310i when i tried to W200 it!
This is how i fixed it.
Try downloading"K310_RED_CID49_R3B010_EROM-FOTA" and write it to your dead K310i.
next "ReadGDFS", Then get a "blank K310 GDFS" and write it to your dead K310i. Now disconnect and remove\ refit battery but DONOT turn on.
Identify Phone, and then use "R4EA031 MAIN_GENERIC_DO_RED49.mbn" + "R4EA031FS_EUROPE_"_RED49.fbn" in main box, in "Firmware update box" put "R4EA031_SFA_EUROPE_2_RED49.sfa, and in "script box" put "CDA102570_127_R2A_GENERIC_TRADE_UNITED_KINGDO M"
Now Flash The Phone with these in place.
When Finished, Use "SimLock Patch Gen" and the "MAIN.mbn" used earlier and make a ".vkp" file.
Re connect phone with "read GDFS". Once connected put your ".vkp" file in "script" box and "Write Script".
Disconnect when finished, your phone SHOULD be BACK 2 LIFE, Unbranded, an unlocked.
Thats how i Revived mine. Hope it works for ya.