They look like Xrotor 10A. Anyway, it looks like you should be able to use FC passthrough to flash BLHeli. Otherwise, you will need to do it using an Arduino and the C2 ports. It is not likely you brick your ESC.
http://dronehitech.com/en/flash-silabs-e...-firmware/
https://nathan.vertile.com/blog/2015/11/...via-4w-if/
http://intofpv.com/t-flashing-dys-xsd30a...rite-error
http://dronehitech.com/en/flash-silabs-e...-firmware/
https://nathan.vertile.com/blog/2015/11/...via-4w-if/
http://intofpv.com/t-flashing-dys-xsd30a...rite-error