5700 flashing problem
 

5700 RM-230 phone is working but i want to update firmware from 4.21 to 5.11 when i connect to jaf it connects but shows error finding cmt boot file looks like phone has boot ic problem but it is working fine whats wrong with it ? Help me out friends

Also in usb flashing it shows error sync phone and ask for driver of nokia ROM ! Can somebody explain me what is nokia rom ?

Seems like nobody here to help