If 1.5 was the highest you have been, just put the 1.4 firmware on your SD card the same as you do for any other FW update. If you have been higher than 1.5 already (had 1.6 installed for example) you may not be able to go as far down as 1.4 anymore.
If you dont have the 1.4 FW, you can get it here directly from DJI:
80 to 90% battery level takeoff is triggering outrage | Page 5 | DJI Phantom Forum
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