===== Replacing the Legs =====

Unscrew the two screws underneath Marty's head, just above the legs.

{{ :martyv2:support_faqs:head_scerws.jpg?nolink&300 |}}

Slide the old leg off towards you, grip the head to make this easier. Then slide the new leg into position. Screw it back in place.

{{ :martyv2:support_faqs:replace_leg_gif.gif |}}

**Repeat for both legs.**

===== Renaming Marty's new legs =====

After replacing Marty's legs, **you'll need to update the sensor names** so Marty can recognise the new sensors correctly. This is important for features such as Marty Unplugged.
 
First, connect your Marty in the **[[https://robotical.app/|Robotical App]]**.

Then, click on the *robot settings** button in the bottom left, then select **add-ons** as shown

{{:martyv2:support_faqs:robot-settings-add-ons.png?nolink&1200|}}

You should see the sensors attached to your new legs in the add-ons list. The sensors from your old legs may also appear, but they'll be greyed out and labelled Not Connected.

{{:martyv2:support_faqs:screenshot_2025-12-11_161042.png?nolink&800|}}

Click **Restore add-on names** to update the sensor configuration. This allows Marty to recognise the replacement sensors correctly so they can be used with Marty Unplugged and Blocks.

{{:martyv2:support_faqs:screenshot_2025-12-11_161214.png?nolink&800|}}

Once the sensor names have been restored, **check that Marty can detect the sensors correctly.** 

You can also test Marty's walking to make sure the replacement legs are functioning properly.