Naah, don’t worry 
, it is nearly impossible to delete the RoS (if not via hardware).
Normally you can reset the device and it will (should) be exactly in the same condition you received it.
The reset procedure is easy enough, though you might need to try it a few times as the exact timing (when to press and when to release the reset button) can be tricky..
https://help.mikrotik.com/docs/spaces/ROS/pages/24805498/Reset+Button