"Software tweaks" refers to small adjustments or modifications made to a computer program or application to improve its performance, fix issues, or add new features. Full definition
This is a smartphone which also includes a number of software tweaks. (androidheadlines.com)
This is something both companies can and probably will fix with software tweaks as the hardware matures, but depending on your usage preference these behaviors could be significant. (androidcentral.com)
Otherwise, expect a few kid friendly software tweaks on top of either the 6 - inch or 7 - inch Fire HD tablets. (androidauthority.com)