A "successful reboot" refers to making something start over in a better or improved way. It means that a system, project, or product, which may not have been working well, has been restarted and now works efficiently or effectively. Full definition
That, to me, seems like a very successful reboot. (gamnesia.com)
After a very successful reboot of the series in 2011, Rayman and gang are back for another outing with Rayman Legends, the sequel to Origins. (glitchcat.com)
There have been hugely successful reboots like 21 Jump Street, and massive failures - I'm looking at you the Baywatch movie. (thexboxhub.com)