What steps have you tried so far? What changed between last time and this time that made you want to image again? Are you seeing any response to power?
Are you using the third-party SD card writers listed in this documentation: https://docs.wpilib.org/en/stable/docs/software/roborio-info/roborio2-imaging.html ?
Does the image match this text: Supported image files are named FRC_roboRIO2_YEAR_VERSION.img.zip. You can locate them by clicking the SD button in the roboRIO Imaging tool and then navigating to the SD Images folder. It is generally best to use the latest version of the image.
We'll be able to help better if we understand what "randomly broke and will not reimage" means.
