Hi,
I am having the same issue.as Oguz Kekec.
No answer in Putty on the Xiaomi Hub serial port.
Interface wired as : Tx-Rx, Rx-Tx, GND-GND
If I hit return in Putty, Hub remains blinking.
If I don’t hit return in Putty, Hub goes from blinking to fix blue light (standard behavior)
Any clue ?