I am waiting for this smartphone from this page:CN Version Oneplus 15 flashed with the international system OxygenOS via OTA, supporting OTA upgradesSave $100 With Coupon Code: gshopper100 Extra gift included:Purchase a OnePlus 15 and receive a free phone case and screen protector.The OnePlus 15 package includes a data cable and a CN charger plug. Purchases that do not include the original 120W charger package will receive a free 67W EU...www.gshopper.comIt is CN Version Oneplus 15 flashed with the international system OxygenOS via OTA , supporting OTA upgrades with locked bootloader.How to unlock bootloader on this ? I read that it is necessary to reload ColorOS but I don't know how to do it , please help !