For most users, unlocking a Docomo bootloader is unless you are an advanced developer. The top 3 reasons to do it: installing GSI (Generic System Image), removing carrier bloatware, or porting LineageOS. If that is you, use the exploit method or paid service.
: NTT Docomo (Japan) is known for hard-locking bootloaders on their devices. Unlike international versions, the status in the service menu usually reads "Bootloader unlock allowed: No," which generally cannot be changed through official channels [1, 3]. docomo unlock bootloader top
A widely used (though often paid) third-party tool that can sometimes flip the "Allowed: No" status to "Yes". For most users, unlocking a Docomo bootloader is