نزار المحفوظ Nezar Almahfooz

Good time all I have recently own a new 2021 GM Yukon SLT in Iraq. Suddenly the lane keep assist system and car and front pedestrian alarm disappeared. I checked the GMC manual and went through the clearing steps for the problem and didn't solved. the message in the screen ( Lane assist system is not available) ?? I went to Almansoor company my dealer in Baghdad ( driving about 500 Kms) and they couldn't solve the problem event after resetting and updating the system. please any solution?