Unlocking the bootloader on NTT docomo devices (specifically Sony Xperia, Sharp Aquos, and Samsung models) is a historically difficult task because docomo typically hard-locks the bootloader at the factory level. www.oneplus.com
How Android supports (and restricts) unlocking docomo unlock bootloader top
Network Stability: Ensuring the device operates within strict regulatory parameters for Japanese radio frequencies. Unlocking the bootloader on NTT docomo devices (specifically
Because Docomo does not provide official codes for unlocking, a "grey market" of tools and exploits has emerged over the years: Cause: The carrier flag is set to 0
0.QPST (Qualcomm) or Octoplus. You must rewrite the persist partition with a generic Docomo value. This is advanced; consider a paid service.: docomo maintains strict control over their software to ensure the stability of proprietary services like Osaifu-Keitai (mobile payments) and 1seg/Full-seg TV. Security & DRM