I found the workaround of the double reboot after applying the most recent security patch.
Follow the instructions:
1. Make any backups, especially important data and the home launcher, just to preserve the icons.
2. Make sure to download the 18 mb patch, not the 157 kb. Anyway press download and don't touch reboot.
3. Reboot to safe mode, it just boots the phone without the user apps.
4. Check the security patch and reboot if asked to.
5. Check again the security patch to see which version you have. If it's June (the current) then you're good to go and need only to restore the home launcher.
I attach the screen that proves that the steps above worked for me.