Sony Xperia devices have a "Bootloader Unlock Allowed" status in the service menu.
A: Your firmware is too new. Wait for an update (unlikely) or use an alternative method. qunlocktool sony
Because this is a server-based service, you cannot simply download the tool and use it for free. You must purchase a credit. Sony Xperia devices have a "Bootloader Unlock Allowed"
Perhaps the most pragmatic advice for future buyers is to avoid Japanese carrier-locked models if bootloader unlocking is a priority. Opt for the global version of the phone, which will almost always have "Bootloader unlock allowed: Yes." Because this is a server-based service, you cannot
Sony devices use a proprietary "Flash Mode" (accessed by holding Volume Down while plugging in USB) and "Fastboot Mode." QunlockTool exploits these low-level environments to modify the partition table (GPT) and the TA partition, which contains the "Trim Area" data—where DRM keys, Bootloader status, and Lock status are stored.
: It clears the Google Factory Reset Protection (FRP) screen without requiring the original owner's account credentials.