How to refresh Firmware?

Update content:

ME40Pro firmware update v2.4.0.

Update content:
1. Communication baud rate is 115200bps.
2. Adapt WIFI module firmware ≥ V3.1.
3. The WIFI distribution network mode is changed to the web page mode.
4. Added TPU advance and retreat options

Update content:

1. Get into check M503 via serial debugging tool

update content:

1. Fix some errors in help documentation