It can be fiddly, but with modern Amlogic devices, unless you cause electrical damage to the eMMC chips there's really no such thing as a bricked box.
You need to connect the box to a Windows PC using a USB > USB cable and flash the image directly to internal eMMC (not NAND). flashed the wrong image) using the Amlogic Burning Tool app and an appropriate firmware image (look on freaktab). S905X3 devices can be (or should be) recovered from broken boot firmware (e.g.
