After a code review I didn't find anything that would inadvertently change permissions for busybox. The only time adbLink sets busybox perms is on installation, where they are set to 0755. So, the 666 perms are still a puzzle to me! For upcoming adbLink version 3.5, I added in permission checks for busybox prior to use and I also added a utility menu function to manually reinstall busybox and set perms. Thanks again for the report.