If your HG150UB is connected to a network, this is the easiest method.
The adapter resets, exits DFU mode, and boots up using the newly installed firmware. Why You Should Update the Firmware hg150ub firmware update work
Updating the firmware on a device like the FiberHome HG150-UB If your HG150UB is connected to a network,
Following the correct, sequence-based update method minimizes the risk of errors. Follow these steps to apply the update: exits DFU mode
Compare the listed there against the version number of the file you downloaded.
Release the button and let the device boot normally for 2 minutes. Try accessing the web interface again. Method 2: Emergency TFTP Recovery Mode