Given that it supports older iPhones it won't be Bluetooth 5. Android has notoriously difficult to develop for Bluetooth LE support, due to the large number of

Given that it supports older iPhones it won't be Bluetooth 5. Android has notoriously difficult to develop for Bluetooth LE support, due to the large number of combinations of drivers, low-level Bluetooth stacks (last time I looked into this there were 4 contributed by different chip vendors and manufacturers) and API iterations. It becomes really difficult to achieve even basic tasks never mind something a little more unusual such as downloading larger amounts of data as a background task. Though it is certainly ironic to find Google struggling with this as well...