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The U4025QW monitor will not display video after a firmware update without powering the monitor off and on.
The monitor keeps at ISP mode after the ISP firmware update success and needs power turned off and on to reset. The USB ISP tool sends a command ISP TAG again after the firmware update success and the scaler switch I2C MUX to the HUB causes the scaler to read fail from the PD, then this causes the monitors Thunderbolt to fail.
Firmware Update Process After updating the Dell U4025QW monitor to firmware version M3T102, unplug the power cable for five seconds to complete the firmware update. Wait until the power indicator is completely off and then insert the power plug. Back to Top
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