RF24 Library: Driver for nRF24L01(+) 2.4GHz Wireless Transceiver

Using Arduino Networking, Protocols, and Devices
110

finnduino:
It's still showing this when I look status of module:
Data Rate = 1MBPS
Model = nRF24L01
CRC Length = 16 bits
PA Power = PA_HIGH

Should radio.setDataRate(RF24_250KBPS); affect immediately?

This will never work, because the 250KBPS speed is only available on the newer nRF24L01+ chip, not the older nRF24L01. Get the data sheets from Nordic and read up on the chip differences.