se w850i flash very big problem please help me

I have just put the log of setool look up

I have to pay for having d-ultimate unlocker ? is not free?
is sure it will work?

you need to downgrade your CID so that you can flash CID52 firmware, you can also repair with d-ultimate unlocker too at one go if you have enough logs

ok so d ultimate unlocker is the only way to repair my w850i?

since there is no firmware for W850 CID53, the only way is downgrade your phone CID53 to CID52 with d-ultimate unlocker and flash again CID52 firmware from Top Sony download area