j260f u2 flash failed custom blocked by oem unlock

Operation: Flash
Selected model: SM-J260F
Software version: 36.6

File analysis... OK
Total file size: 0x49F54170 (1183 Mb)
Searching USB Flash interface... COM4 detected
Setup connection... OK
Reading PIT from phone... OK
Sending sboot.bin.lz4... OK
Sending param.bin.lz4... OK
Sending cm.bin.lz4... OK
Sending boot.img.lz4... error timeout
Done with Samsung Tool PRO v.36.6