I have a SGP 771 in the U.S., came from overseas - Upgrade help

[sbollero]

Hey guys!

I used to be pretty involved with XDA as I own Nexus 6, Nexus 7, Nexus 9 and Pixel XL. I work for an electronics distributor and we have sold Sony tablets for years. This tablet came from e-bay or Amazon before we could order through the Sony channel. It came with a Bluetooth keyboard with Korean? symbols on it.

That's the background:

So the tablet is currently running 5.02 and checking for software updates gives me nothing.

Build number: 28.0.A.8.251
Kernel has a date of Aug. 19, 2015

My question is whether this is a special build and why I can't seem to update it. Not that familiar with Sony's software for updates but when checking this build it seemed to show as a demo version and didn't have anything for a more recent update file.

Can anyone give me any background? I'm not necessarily looking to root it, I just want to update it to the current software (Android M?).

Thanks for any help or tips!

 

[DHGE]

Maybe the bootloader is unlocked. Check the service menu.
With unlocked bootloader there are no OTA updates any more.

You can flash any suitable ROM with Flashtool. This software comes with XperiFirm to download the ROMs.

If it is really a demo unit (they run different ROM-versions though) I would return the tablet.

 

[quickiwiki]

Hey guys!

I used to be pretty involved with XDA as I own Nexus 6, Nexus 7, Nexus 9 and Pixel XL. I work for an electronics distributor and we have sold Sony tablets for years. This tablet came from e-bay or Amazon before we could order through the Sony channel. It came with a Bluetooth keyboard with Korean? symbols on it.

That's the background:

So the tablet is currently running 5.02 and checking for software updates gives me nothing.

Build number: 28.0.A.8.251
Kernel has a date of Aug. 19, 2015

My question is whether this is a special build and why I can't seem to update it. Not that familiar with Sony's software for updates but when checking this build it seemed to show as a demo version and didn't have anything for a more recent update file.

Can anyone give me any background? I'm not necessarily looking to root it, I just want to update it to the current software (Android M?).

Thanks for any help or tips!

I've run into the same problem. Moreover, I have found that when I type in my tablet's IMEI at http://support.sonymobile.com/gb/software/ the page responds with 'No information available'

Seems to be a problem at Sony.

Please, contact the Sony Mobile support so that they can fix it. The more requests they receive, the faster they will fix it