Bought during lockdown, forgotten in a box, found at the weekend. Getting the MHS35 3.5″ TFT touchscreen working on Raspberry Pi OS Trixie (64-bit) is straightforward once you know the correct approach. The instructions in the box are out of date, the product page has been updated but leaves gaps around rotation and touch recalibration. This guide covers the complete setup from fresh Trixie install to a correctly oriented and calibrated display, including what the installer script actually does under the hood and why.