is the bootloader unlocked by default?

[kolporaj]

Hi,
I've purchased the phone 1 week ago. After that I got OTA update notification of september security patch. I updated.
But everytime i restart the phone i get the following msg

"your device software cannot be checked for corruption. pls lock the bootloader"

I've never unlocked the bootloader and got the msg from the first day.
Does google or xiaomi released both locked and unlocked version of the A1? or something is fishy here?
Pls help

Screenshots below:

 

[jack_21]

Well, no. It is not unlocked by default
But maybe it was unlocked by the seller.

However it is very easy to unlock the BL if you don't use root or you're gonna to change rom:

fastboot oem lock

 

[afrizal87]

I'm afraid you buy the phone from the wrong place, try to return with new one or ask for refund,new device shouldn't be unlocked by default,always buy in trusted seller!