How to switch a Fit AP to a Fat AP

@JohnSnow hi,
What is the AP model?

Hello,

Please follow the below steps to connect to the AP and change it to FAT mode.

1. Set the IP address of the PC to 169.254.1.100 and mask to 255.255.0.0 so that the PC and AP are located on the same network segment.
2. Open PuTTY on the PC, enter the IP address and port number of the AP, select the SSH mode, and click Open. If a key pair information prompt is displayed, click Yes.
3. When the following information is displayed, the AP is connected successfully. Enter the user name and password to log in to the AP.

login as: admin
Further authentication required
admin@169.254.1.1's password:admin@huawei.com //For information security, characters you entered are invisible.

Info: Current mode: Fit (managed by the AC). //The current mode is Fit.
Info: You are advised to change the password to ensure security.
<Huawei>
4. Check AP information.

<Huawei> display version
Huawei Versatile Routing Platform Software
VRP (R) software, Version 5.170 (AP4050DN FIT V200R007C20SPCa00) //Model, working mode, and version
...
Start the switching.
5. Switch the AP mode to Fat. The AP will restart and the restart takes around 2 minutes.

<Huawei> system-view
[Huawei] ap-mode-switch fat
Warning: The system will reboot and start in fat mode of V200R007C20SPCa00. Continue? (y/n)[n]:y
Info: system is rebooting ,please wait.................

After reboot ends login again and check version.

I think this documentation materials will help you: https://support.huawei.com/enterprise/en/doc/EDOC1100081212.

Wow, it's very nice. Thanks!