Bootloader unlock allowed: No

[Jo1956]

We recently bought a Xperia Z4 Tablet. The service menu says Bootloader unlock allowed: No and I assume the usual procedure to open the bootloader did not work because of this. What can I do to change Bootloader unlock allowed: No to Bootloader unlock allowed: Yes? We need root access for the device. It is a university device for field work and the decision for SONY was because of the good support for developers. Without root the tablet is of little use. Any suggestions? Thanks in advance! Jo

[Penny666]

@uliwooly

Why would Sony make some e2303s with an unlockable bootloader and others without?

[Uliwooly]

@Penny666

The reason are the carrier networks, they, not Sony, they request the bootloader to be locked, once that's done it can't be undone unless the motherboard it's replaced. 

[EdgeMelee]

What phone you use?