Will the iPhone 7 plus get slow sync flash

[aayush pandey1]

It has helped in low light photography for the 8 and X

 

[bamf-hacker]

Unfortunately, not likely. In general Apple pushes the new hardware with the new features.

 

[Raptor007]

I am not sure if the hardware is able to support it, but even if it did Apple wants users to buy the new device to get the new feature.