TPLINK ARCHER C6 Bootloader Damaged

Hello everyone, im trying to tftp flash stock firmware on my C6 (ori and also stripped version too)
The tftp would succeed but i keep booting back to Openwrt
Another situation i tested with another PC is that the tftp would stop around 60% more or less.

Is a switch really necessary to tftp the stock firmware to this router?
How do i confirm that my boot loader is damaged?