The firmware is updated monthly but because of Chinese New Year things have been quite. A new firmware is coming out based on Micropython 1.7 but only a test version is available. As to pycharm, never heard of it.
I'm also looking at what to do with these two RF433 units. I want to send a RF signal to the TV to change the channel. I assume this is what can be achieved (after I know the correct codes).
The following example looks like going down the right direction (albeit with a different RF device).
If anyone has other examples for the M5Stack and RF433 units specifically that would be great.