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I have a very low value lenovo tablet that my provider was giving away essentially for free (for worthless loyalty points I think). its BL cannot be unlocked, it has a special bootloader that does not implement the standard unlock commands.
Other than that, I have to admit I don’t often deal with cheap phones, because my experience was that not even LOS supports a lot them. Maybe that’s changed though.
Yes, that can happen sometimes, but I find that there are plenty of cheap options with unlocked bootloaders if you look for them.