OpenWrt support for Xiaomi AX3000T

Hi, here I've bricked another Xiaomi AX3000T for my first time flashing OpenWrt. Details are as below:
router model: RD23 with ESMT nand flash
stock firmware ver: 1.0.49 (INT)
flashed OpenWrt ver: 23.5.05

I flashed the firmware following the instructions on official site(API RCE method), and it was successful at first, but bricked after an power outage. The router led blink really slow and cable connection would be no effect at all, just as this thread -Xiaomi AX3000T bricked(no rapid blink)- mentioned too. The problem seem can be solved by installing UBoot, but currently I have no tool to reset it via UART.
Does many people facing the same problem and fixed through UBoot installation too? Scared of bricking the whole router thoroughly.