Depending on your customer it needs to be locked or open. Don't know...Ok thanks a lot.
I thought that the failed upgrade through the Ota that I've been trying this years were due by the unlocked bootloader.
The phone had Oxygen 8.1 installed and tried to install the package Oxygen 5.1.4 (1609Mb) but the installation was always failed after the boot but nevertheless it has been the best phone I ever had (it has been very stable and I have never need root, etc.)!!
Yesterday I tried to download the latest official version 9.0.11 (A5000_23_200224) from OnePlus website and all things were done...
Now I'm thinking whether is it convenient keep the unlocked bootloader or not when I decide to sell it.
What do you think?