i've runned an update, and there was a kernel update that installed kernel-4.4.4-301.fc23.x86_64 as update of kernel-4.4.4-301.fc23.x86_64 but when i'm going to boot, system kernel remains blocked and system doesn't start.
*********** MASS BUG UPDATE ************** We apologize for the inconvenience. There is a large number of bugs to go through and several of them have gone stale. Due to this, we are doing a mass bug update across all of the Fedora 23 kernel bugs. Fedora 23 has now been rebased to 4.7.4-100.fc23. Please test this kernel update (or newer) and let us know if you issue has been resolved or if it is still present with the newer kernel. If you have moved on to Fedora 24 or 25, and are still experiencing this issue, please change the version to Fedora 24 or 25. If you experience different issues, please open a new bug report for those.
at the moment, i'm running fedora 24 with Linux 4.7.5-200.fc24.x86_64
I'm going to assume that means the current kernel is working. Please file a new bug with a description of the problem if you are still seeing issues.