The bootloader is the first piece of software that runs when you turn on your phone, responsible for loading the operating system. Sony devices include a specific "Rooting Status" in their service menu to indicate if this can be bypassed.
: Usually, the original network provider requested that Sony permanently lock the bootloader to prevent users from modifying firmware while under warranty or contract. Methods to Change Status from "No" to "Yes" bootloader unlock allowed no to yes
: Open the phone dialer and enter *#*#7378423#*#* . Navigate to Service info > Configuration > Rooting Status . The bootloader is the first piece of software
In many instances, the bootloader lock is tied directly to the SIM lock. Methods to Change Status from "No" to "Yes"
When you find that your Android device—specifically a Sony Xperia—lists in the service menu, it generally indicates a hardware or carrier-level restriction that prevents standard unlocking procedures.
Changing this status from to "Yes" is famously difficult because it is often tied to carrier branding or specific regional hardware configurations. Understanding the "Bootloader Unlock Allowed" Status