Please note that the head tracking board and the main control board must be used as a matching set. Different Goggles X hardware versions use different head tracking boards. If you want to replace the head tracking mainboard to add the built-in head tracking function, the complete set of mainboards must be replaced. Installing incompatible hardware may cause the device to malfunction, short circuit, or become damaged.
Goggles X units without a built-in head tracking module must use an external expansion module to enable head tracking. This module can be purchased from the official website or official store.

If the expansion module is already installed but the Head Tracking option in the menu still cannot be accessed:
The connected 3.5 mm audio cable may be incorrect. Goggles X must use a 4-to-5-pin 3.5 mm audio cable, with the 5-pin end connected to Goggles X.

If neither of the solutions above resolves the issue, the internal I/O board of the Goggles X may be faulty. Please contact official after-sales support for assistance.
Some older production batches may be refurbished and resold. Refurbished units will be clearly marked as refurbished on the product exterior.