Procedure
-Open Xperia Companion
-Tick Software Repair
-Check box (My device cannot be detected or started) then Click NEXT
-Select on Xperia Phone or Tablet then Click Next
-Check box (Yes, I know my google account details then click NEXT
-Wait to initializing then click NEXT
-Then press and hold volume down wait until phone will detect & proceed to Flash
-Wait & done
-Open Xperia Companion
-Tick Software Repair
-Check box (My device cannot be detected or started) then Click NEXT
-Select on Xperia Phone or Tablet then Click Next
-Check box (Yes, I know my google account details then click NEXT
-Wait to initializing then click NEXT
-Then press and hold volume down wait until phone will detect & proceed to Flash
-Wait & done