Thanks for your very informative input. Appreciated.
I cannot get to twrp recovery other than the fastboot method via pc.
Also, I cannot power off the phone in the bootloop situation as it always keep the MI and power by android logo on.
The only way I did is to flash the stock rom by sideload and then reinstalled the eu beta rom again.
Also, I found that when unistalling unwanted mi bloatware apps, if I delete the sim activate software I will end up in bootloop.
Anyway thanks for the reply. Cheers