According toDroidLife, the update is Oreo 8.0 (not 8.1) and it comes in at a fairly hefty 1702.3 MB.
Android 8.0 Oreo transports a slew of exciting features, including support for Picture-in-Picture (PiP), notification channels and adaptive icons, as well as a plethora of bug fixes, stability improvements and an exciting new Easter egg.
The Sony Xperia R1 and R1 Plus smartphones were launched back in October 2017 at Rs 12,990 and Rs 14,900 respectively. Additionally, some users have since reported issues like app crashes and touch unresponsiveness after updating to Oreo. In order to update to the latest operating system, users need to go to Settings About Phone Software Update.
Apart from that, FoneArena cites user reports to claim the Xperia R1 and Xperia R1 Plus will also get features such as Xperia actions - an intelligent service that suggests actions based on interaction with games on the phone, contextual menus for app shortcuts, reminders for unfinished emails and messages, and more. Unfortunately, the update only includes the January security patch and not the latest one from March or even February.
While there is no news yet about V30 Oreo updates from other carriers, now that Verizon has released its update other networks will likely not be far behind. They both packed similar features, but the difference is in the storage and RAM options.
The Xperia R1 duo has Sony' signature design language, and there's a 5.2-inch HD display on the front. The Xperia R1 offers 2GB of RAM and 16GB of internal storage, while the R1 Plus offers 3GB of RAM and 32GB of internal storage. They are powered by an octa-core Qualcomm Snapdragon 430 SoC. Both smartphones have a 13-megapixel camera at the rear with Predictive Hybrid Autofocus and an LED flash. Both the smartphones are backed by a 2620mAh battery.