Downgrading Firmware of Xiaomi Mijia Smart Multi-Mode Gateway (ZNDMWG03LM)

Hi, I have the same problem as luc1 - corrupted bootloader trying to interrupt boot.

kernel[0]: sum:0x0000, size:0, fail:0
          [1]: sum:0x0000, size:0, fail:0
rootfs[0]: sum:0x0000, size:0, fail:0
          [1]: sum:0x0000, size:0, fail:0
root_sum_check: off
watchdog_time: 0
boot_version: 1.0.2.005
priv mode
Info: kernel 0 is invalid
Info: kernel 1 is invalid
Warn: all kernels are invalid !

I hope you can help !

The original values were

kernel[0]: sum:0xcb43, size:2157572, fail:0
          [1]: sum:0xc8cf, size:2157572, fail:0
rootfs[0]: sum:0x742c, size:10108932, fail:0
         [1]: sum:0x62c6, size:8552452, fail:0

What would be the sequence to re-enter these values ?