Mouse back and forward buttons changed after firmware update?

After a mouse firmware update, its back and forward buttons may open different pages, do nothing, or trigger the wrong action. The update may have changed a button profile rather than broken the mouse.

Check whether the buttons register, then compare their assigned actions in the mouse software and the app where you use them.

Find the cause

Open the Mouse Test and press each side button separately. Check whether the test detects both presses. Avoid testing in a tab with unsaved work, since a button may navigate away from the page.
Try the buttons in the app where you noticed the change. Note what each one does, including whether the actions have swapped or trigger a different command.
Try another browser or app. If the buttons behave differently there, the issue may be an app-specific setting or profile rather than the mouse itself.
Open the mouse's configuration software and check which profile is active. Look for settings that assign actions to the side buttons, including settings tied to a particular app.
If possible, connect the mouse to another computer and test it there. This helps separate a mouse or firmware problem from settings on your computer.

What the result means

Both buttons register, but perform the wrong actions

The mouse is sending input, so a mapping or profile is a likely cause. Firmware updates can reset settings or change which profile is active. Check the button assignments in the mouse software before assuming the switches have failed.

One button is missing from the test

Check whether the button is also missing in another browser or on another computer. If it works elsewhere, a browser or system setting may be blocking or handling the input differently. If it fails everywhere, the mouse, its connection, or its firmware may be at fault.

The test detects both, but one app does not

The mouse is producing the presses, but the app may use a different profile or may not support that button's action. Check the app's own controls and the mouse software's app-specific settings.

How to fix it

Restart the app where the problem occurs. Close and reopen the browser or other app, then test the buttons again. This can clear a temporary state left over from the firmware update.
Check the active mouse profile. In the mouse configuration software, make sure the expected profile is selected. Some software switches profiles automatically when you open a particular app.
Review the side-button assignments. Check whether each button is assigned to the intended action. If the software offers standard back and forward actions, select those instead of a changed shortcut or custom command.
Test with one general profile. Temporarily turn off app-specific assignments or select a profile that applies everywhere. If the buttons work normally this way, adjust the settings for the affected app separately.
Reconnect the mouse. For a wired mouse, unplug it and reconnect it. For a wireless mouse, reconnect its receiver or pair the mouse again using its normal instructions. Then repeat the test.
Check the firmware utility's status. Confirm that the update finished successfully and that the configuration software recognizes the mouse. Use the maker's recovery or update instructions if it reports an incomplete update. Do not install older firmware unless the maker specifically recommends it for this issue.

When it may be the hardware

If the same side button fails in the Mouse Test, in another browser, and on another computer, the issue is less likely to be a setting on your main computer. Check for a loose connection or visible damage, but do not open the mouse while it is under warranty. If reconnecting does not help, contact the manufacturer's support team with the button test results and the firmware version.

If the buttons work in the test but not in one app, keep the working profile and check that app's controls first. A browser button can be assigned a different command, so its behavior in one program does not prove the switch is defective.