A Nevera that will not drive or steer at the end of the build is nearly always a connection or pairing issue rather than a faulty car, and it is worth these checks before you email us.
Charge both units fully — the car and the Time Attack Controller — and try again. Low charge on either side shows up as weak, jerky or absent driving.
Compare the drivetrain steps against the build guide at circuitmess.com/blogs/resources: wheels seated fully on their shafts, nothing rubbing against the casing, and every connector on the board seated fully and the right way round per the photographs.
Check the controller pairing. Pairing is done from the Time Attack Controller — follow the pairing steps in the usage guide.
Restore the firmware on both units from code.circuitmess.com on a desktop computer running Chrome, Edge or Opera, connecting the units one at a time. If coding experiments are on either unit, this puts them back to how they shipped.
If it still will not drive or steer, email us with your order number, a short video of what it does when you try, and photos of the underside and the board. Say whether the controller screen responds — a live controller with a dead car points somewhere different from two dead units.
Email that to [email protected]. We look at each case individually, and if a part turns out to be genuinely defective, replacing it costs you nothing — see Do your kits have a warranty?.
If the restore itself will not run — the browser cannot see the device, or it stops part-way — see The firmware restore at code.circuitmess.com fails or cannot find my device.