U3 Firmware
These firmware files require LJSelfUpgrade V1.21 or higher in order to upgrade the U3, which is included in UD driver 3.11 or later.
U3A and U3B refer to old hardware versions of the U3. U3Afirmware is for U3 hardware 1.20, and U3Bfirmware is for U3 hardware 1.21. U3C is for the U3-LV and U3-HV.
The U3 Firmware Revision History page details the changes made in these firmware files.
File attachment:
tags:
Search
Shopping Cart
Testimonials
-
I don't know of many other companies that provide such excellent service. I wouldn't hesitate to recommend your product to anyone.
—Richard, Milwaukee School of Engineering

Comments
#1
Hi,
I purchased U3-LV from an online auction, and downloaded the software. The hardware version is 1.3. I downloaded the firmware file and first few lines of the file is:
Minimum required LJSelfUpgrade version=1.16
:102A7C003E941B9A048875558F98DB4E996A27C42F
:102A8C00588543659C75949E21F2E6BDD80DFC5D7E
:102A9C00D4E193AC1D09E1D6B3E2E78A72210B3481
:102AAC00B7841B4A0403192B460C6BEC80627630FE
And when I used LJSelfUpgrade to upgrade, it showed message:
Unauthorized device. Please call LabJack Corporation at 303-942-0228 or email support@labjack.com for assistance.
Can you please tell me what is the problem?
Thanks!
#2
That means the device was not properly authorized by LabJack, which is part of our final test procedure. A little extra suspicious since it came from an online auction. We will talk to you through email to help you get your U3 going and research where it came from.
#3
My U3's DAC was also stuck on 8-bit, until I downloaded 1.32.
#4
It looks like for me to use the higher resolution of the newest U3 I needed to use the beta v1.35 firmware.
v1.32 (the latest official release as I write this) only gives me the older 8-bit control.
#5
Firmware 1.35 fixes the compatibility mode selection mechanism that forces the DACs to 8-bit mode. All the U3's tested here at LabJack have been stuck in 10-bit mode. I'm not sure how yours got stuck in 8-bit mode.