Nowadays most devices can't be bootloader unlocked at all (see Huawei/BBK(Oppo,Vivo) in China) or can but with difficulties and, in some cases, little to no driver support (see Xiaomi or even Samsung's unlock procedures…
Nowadays most devices can't be bootloader unlocked at all (see Huawei/BBK(Oppo,Vivo) in China) or can but with difficulties and, in some cases, little to no driver support (see Xiaomi or even Samsung's unlock procedures…