I'm not aware of any official "Jump Force Mugen APK" updates. "Jump Force" is a crossover fighting game developed by Spike Chunsoft that features characters from various manga and anime series published in Weekly Shonen Jump. "Mugen" typically refers to a type of 2D fighting game engine that allows for custom characters and stages to be added.

However, it's important to note that "Mugen" games are typically fan-made creations, and their updates might not be widely covered in official news sources. If there have been any updates or developments related to a "Jump Force Mugen APK," you might want to look for information on dedicated Mugen communities, forums, or websites where fans of the game engine share their creations and updates.

Keep in mind that using unofficial APKs can carry risks such as malware, so be cautious and make sure you're getting the file from a trustworthy source if you decide to proceed. Additionally, my information might be outdated, so it's a good idea to search for recent information online or in relevant communities for the most up-to-date details.