Yes, it is possible to undo a jailbreak on your iOS device. If you want to remove the jailbreak, you can do so by restoring your device to its original factory settings. Before you do this, however, you should create a backup of all your data so that you don't lose any personal information or important files.
To restore your iPhone or iPad to its original factory settings, you can follow these steps:
1. Connect your device to your computer using a USB cable.
2. Open iTunes and select your device.
3. Click on the "Restore iPhone" or "Restore iPad" button.
4. Follow the on-screen instructions to complete the restore process.
It's important to note that restoring your device to its original factory settings will erase all data and settings, including your jailbreak and any installed tweaks or modifications. Once the restore is complete, your device will be back to its original, non-jailbroken state.