For developers and advanced users looking to install custom ROMs or firmware, Sony provides an official Unlock Bootloader service Verify Compatibility: Before starting, enter *#*#7378423#*#* in your phone's dialer, go to Service info Configuration Rooting Status . It must say "Bootloader unlock allowed: Yes." Get the Unlock Code: You will need to provide your device's IMEI to the Sony Developer portal to receive a unique unlock key. Flash Tool: You will typically use the standard
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