If you can easily reach the server, you can use a patch cord (eth coper cable), connect your laptop directly to the server management port, set on your laptop an IP from same IP range with default IP address of iBMC management port which is 192.168.2.100, then open a browser and access https://192.168.2.100 (iBMC WebUI) from there you can make necessary changes.
For more details follow bellow link from product documentation.
https://support.huawei.com/hedex/pages/EDOC1000010818YEH1122Q/22/EDOC1000010818YEH1122Q/22/resources/SEMI/V3_SEMI/en/SemiXML(rh2288_v3_hedex)/en-us_topic_0104891327.html
Other details can be found on Rack Server iBMC (V300 or Later) User Guide:
https://support.huawei.com/enterprise/en/doc/EDOC1100048786?idPath=7919749|9856522|21782478|21782482|8060757