Hi friend!
To switch a Fit AP to the Fat or cloud mode on the AP, the administrator must connect a PC to the console port on the AP to log in to the AP, connect GE0/0/0 on the AP to a TFTP or FTP server, and switch the Fit AP to a Fat APor cloud AP.
Before switching a Fit AP to a Fat AP or cloud AP, complete the following task:
Upload the system software file of the Fat AP or cloud AP to the TFTP server, FTP server, SFTP server, or AP backup area.
You can refer to the link https://support.huawei.com/hedex/hdx.do?docid=EDOC1100096145&id=EN-US_TASK_0176913878&lang=en
Hope to help you!