How to Downgrade CRS125-24G-1S to 6.49 CLI: Step-by-Step Guide

The MikroTik CRS125-24G-1S is a highly efficient switch designed for advanced networking tasks. However, there may be situations where downgrading the RouterOS firmware becomes necessary. This comprehensive guide will walk you through the process of downgrading CRS125-24G-1S to RouterOS version 6.49 using the Command Line Interface (CLI).

We’ll cover everything from backup procedures and compatibility checks to troubleshooting common issues, ensuring that you have a seamless experience.

Why Downgrade CRS125-24G-1S to RouterOS 6.49?

There are several reasons why you might want to downgrade your CRS125-24G-1S to RouterOS version 6.49:

1. Compatibility Issues: Newer versions may not support specific configurations or third-party applications.
2. Stability Concerns: Some users report better stability with RouterOS 6.49.
3. Feature Requirements: Certain features might be deprecated or altered in newer versions.

Before proceeding, it is essential to weigh the benefits and drawbacks and ensure that downgrading aligns with your network requirements.

Pre-Downgrade Preparations

1. Backup Configuration Files

Backing up your current configuration is crucial to avoid losing important settings. Use the following CLI command to create a backup:

/system backup save name=crs125_backup

You can also export the configuration in a human-readable format:

/export file=crs125_config

2. Verify Current RouterOS Version

To check the current version of RouterOS installed, use this command:

/system resource print

Look for the version field in the output.

3. Check Device Architecture

Ensure you download the correct RouterOS package by verifying the device’s architecture:

/system resource print | grep architecture

The CRS125-24G-1S typically uses the mipsbe architecture.

Downloading RouterOS 6.49

1. Visit the MikroTik download page.
2. Navigate to the archive section and locate RouterOS 6.49.
3. Download the appropriate package for the mipsbe architecture.
4. Verify the integrity of the downloaded file by checking the checksum provided on the website.

Uploading the RouterOS Package to the Device

To upload the package, you can use an FTP client or the built-in CLI commands.

Using FTP

1. Connect to the CRS125-24G-1S using an FTP client (such as FileZilla).
2. Transfer the downloaded .npk file to the root directory of the device.

Using CLI

Alternatively, use the CLI to upload the package:

/tool fetch url="ftp://yourserver.com/routeros-mipsbe-6.49.npk" user=yourftpuser password=yourftppassword

Ensure that the file has been successfully transferred by listing the files:

/file print

Downgrading CRS125-24G-1S to RouterOS 6.49 via CLI

1. Once the package is uploaded, execute the following command to downgrade:/system package downgrade
2. Confirm the action when prompted.
3. The device will reboot automatically to apply the downgrade.

Post-Downgrade Steps

Verify RouterOS Version

After the downgrade, check the installed version using:

/system resource print

Ensure that the version is now 6.49.

Restore Configuration

If needed, restore your configuration from the backup:

/system backup load name=crs125_backup

Alternatively, import the exported configuration:

/import file=crs125_config.rsc

Test Device Functionality

Verify that all network services are functioning correctly. Check routing, firewall rules, and interface configurations.

Updating RouterBOARD Firmware

To ensure compatibility, update the RouterBOARD firmware:

1. Check the current firmware version:/system routerboard print
2. Upgrade the firmware if needed:/system routerboard upgrade
3. Reboot the device:/system reboot

Troubleshooting Common Issues

Device Fails to Boot

If the device fails to boot after the downgrade, perform a safe mode recovery by holding the reset button during power-up.

Incompatible Configuration

If configurations are incompatible, revert to the backup or manually adjust the settings.

Package Missing

Ensure that the correct package for mipsbe architecture is uploaded.

Best Practices for RouterOS Management

• Regularly back up configurations.
• Stay informed about RouterOS updates and changes.
• Test new versions in a controlled environment before deployment.

Conclusion

Downgrading the CRS125-24G-1S to RouterOS 6.49 via CLI is a straightforward process when done correctly. By following this guide, you can ensure a seamless transition with minimal disruption to your network.

FAQs

6. Can I downgrade CRS125-24G-1S using Winbox instead of CLI? Yes, Winbox provides a graphical interface for downgrading RouterOS. However, the CLI method is often faster and more reliable for advanced users.

7. What is the risk of using an incorrect RouterOS package during the downgrade? Using an incorrect package can result in system instability or failure to boot. Always ensure you download the correct package for the mipsbe architecture.

8. How can I verify the integrity of the downloaded RouterOS package? Check the checksum provided on the MikroTik website and compare it with the checksum of the downloaded file to ensure integrity.

9. Is it necessary to disconnect all clients during the downgrade? While it is not mandatory, disconnecting clients can prevent disruptions and ensure a smoother downgrade process.

10. Can I schedule RouterOS downgrades during maintenance windows? Yes, it is best practice to perform downgrades during scheduled maintenance windows to minimize the impact on network operations.

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