DATAQ Firmware Upgrade Center for DI-11xx, DI-21xx, DI-41xx, D-42xx, and DI-47xx: Click the link and download the zip file, you will find all the firmwares inside, including non-standalone version for older hardwares under \oldhardware directory

Firmware	Major Updates
Beta Firmware	Beta firmware for testing purpose only
Rev 1.39	Adds support for DI-2160 Event recorder Adds LOCAL/UTC timestamp options for CSV files Fixed a range error in DI-4730 stand alone operation
Rev 1.38	Fixed a range bug in DI-4718's ASCII outputmode Fixed negative trigger level bug DI-2108P now supports CDC mode
Rev 1.37	Starts new files in standalone when buffer overran Fixed timestamp error for 2108P Fix sync error Increase precision in ASCII output mode from .3e to .5e
Rev 1.36	Longer USB wait time before switching to Ethernet Wait until power supply stable before recording in standalone Fixed rate error in CDC mode Fixed 2108P stand alone circular mode error
Rev 1.35	Fixed leap year error in standalone mode Use D5 and D6 as flag in standalone trigger mode (except DI-4730): D5 is low when file is open, D6 is low when trigger is detected. D5 & D6 back to high when file is closed
Rev 1.34	Fixed Rare communication error
Rev 1.33	Fixed DIN 0/1 polarity error in WinDaq
Rev 1.32	Fixed a standalone file error in Windaq format Use RAM to store data if pre and post trigger can be fitted in memory Adds support for CSV circular mode
Rev 1.31	Fixed a standalone file error in Windaq format Use RAM to store data if pre and post trigger can be fitted in memory Adds support for CSV circular mode
Rev 1.30	Add support for DI-4730 Add support for CSV timestamps
Rev 1.29	Fixed DI-2108P unipolar error

To update the firmware for the instrument, please follow this instruction