Hello,
In this case, a bootloader update is unlikely to help. Since RUT200 is quite a new product, I would recommend returning this device for RMA.
Updating the bootloader might also void the warranty, so I would highly advise against updating it.
Could you also clarify what is the behavior of LEDs on the router after the firmware update? Does the WiFi also not come up?
Best regards,
DaumantasG