Bootloader Unlock Allowed: No?

[ultenhiemer]

Hi there,

So I am a bit confused, but mostly I am curious... So I have a Sony Xperia Z4 Tablet (SGP771), I bought it off ebay pre-owned and for awhile I have been curious about rooting this device (mainly to block ads and remove unwanted and unremoveable content [ie Facebook] whilst still using stock android, but rooted). But for awhile now I have known that my device in the service\configuration menu has said 'Bootloader Unlock Allow: No' which has excluded me from what feels like everything available in terms of modifying the system to actually be rooted. The device is network locked to O2 UK, which I also assume the device is network restricted in relation to the bootloader also.

So I am confused because some threads have said about unlocking a locked bootloader, whilst most have clearly stated that their modification is not for my device (After having the bad bootloader message after all). So my question is, could someone tell me what actually is available (If anything at all) For me to root this device?

What I have learnt so far is that if I want to change the 'Bootloader Unlock Allowed: No' I would have to switch the motherboard with another one (Which is clearly an extremely expensive process and not something I would want to do). Other than that I would have to wait for an exploit, But I am not sure if there is one available (Yet?) which brings me to my earlier question. Otherwise I would have to continue to use the unrooted stock android, which I dont really have any issue with because I would definitely still root it and use stock if that was available to me (Blasted bootloader rejection).

I would really apprechiate a response on this and thanks for reading XD

 

[DHGE]

I would contact o2 and see if they can help.
Maybe SONY (doubt they will do it) or a SONY repair center (third party).
Replacing the bootloader should be doable in software.

 

[Cashdev]

No solution to Xperia Z4 Tablet Locked Bootloader

Hello, I got the same model locked to O2 UK as well and as far as I know there's still no solution to that problem, ie changing the rooting status to YES or rooting the device on a locked bootloader like we all rooted previous Xperia devices. O2 requested Sony to lock the bootloader on purpose. There are many reasons for this. One of them is, O2 doesn't want anyone to change the IMEI of their device if it gets blacklisted, for example. Of course Sony (Service Centre) can unlock it but I doubt we find a Sony member of staff who will risk losing their job for doing so. However, there's a way of uninstalling unwanted apps (bloatware) without root, but this method uninstalls the bloatware for the current user only. So basically if you have several user accounts, you'll have to uninstall those apps as many times, and also keep in mind that the operation is not reversible. So the only way to restore those apps is by factory-resetting the tablet which leads to wiping all the user-data. That method is done via a PC and you need to install, I think, Android SDK as well as Sony drivers. The full guide can be found here
https://www.xda-developers.com/uninstall-carrier-oem-bloatware-without-root-access/
Again, this is not reversible unless you factory-reset the tablet.
If I ever find a solution, or a renegade Sony guy lol, I'll let you know.