If you are running RouterOS v7 and want to revert to 6.48.6, you cannot simply click "Downgrade" in the UI (it often fails). You must use Netinstall.

⚓ Always perform a System Backup and Export your configuration before upgrading or downgrading firmware. Mikrotik 6.48.6 Download

: Improvements to SCEP message stability and restrictions on adding/removing W60G interfaces through the GUI. How to Download MikroTik 6.48.6 If you are running RouterOS v7 and want to revert to 6

Then, the magic words she had almost forgotten existed: Mikrotik 6.48.6 Download

After rebooting, go to System > Routerboard and click Upgrade to match the BIOS to the software. ⚠️ Important Considerations

She took the dusty sticky note and stuck it on the main monitor.