SONY XPERIA M5 E5603 MARSHMALLOW FLASHING "ERROR?" PLEASE HELP ME!!

1) I HAVE SONY XPERIA M5 E5603 AND I WANT TO FLASH ANDROID MARSHMALLOW USING FLASHTOOL BUT WHEN I TRY TO FLASH I GET THIS MESSAGE->
SHOULD I CLICK "YES"? AND PLEASE TELL ME WHAT WILL HAPPEN IF I CLICK YES...
*DEVICE WILL BREAK (BOOTLOOP)
*CAMERA AND SOME OTHER FUCTIONS WILL NOT WORK
PLEASE TELL...

SONY XPERIA M5 E5603 MARSHMALLOW FLASHING "ERROR?" PLEASE HELP ME!!

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