Hi, I only found the instruction below to update wallpaper for single 8800 MPP Webex calling phone,https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cuipph/MPP/8800/english/AG/p881_b_8800-mpp-ag_new/p881_b_8800-mpp-ag_new_chapter_010100.html#task_F...