We have been using zidoo x9s devices (at business) from long time and recently coming across an issue which can be solved by running a simple shell script every time when device boots up. I need to understand how to do that ? I looked at the options of init.rc files but they aren't persistent across boots apart from being a little risky. Hence I am avoiding that. Also I already have looked at the openWRT and noticed that it supports 'crontab'. How do I use that to launch a certain script placed in Android file system (in /data) ? Is there any other way to do that ?