There are four known firmware versions 1.00e, 1.01a, 1.01b, and 1.02c. Per the CHDK FAQ 1.3 Without having USB connected to PC, power on in PLAY mode with ver.req file on SD card, press and hold FUNCSET, press ZOOM OUT to reveal the firmware version. For example: Canon PowerShot A470 P-ID:317A NT D Firmware Ver GM1.01B NoError Feb 12 2008 21:18:24 A subsequent press of ZOOM OUT (while still holding FUNCSET) reveals (for example): Adj Ver.010.004 If you power on in PLAY mode without ver.req on the SD card and press the FUNCSET and ZOOM OUT buttons simultaneously, the screen shows: