Do not power off the device or remove the USB drive during the update process, as this can corrupt the system and prevent it from booting again.
: Select the specific update file from the list using the direction keys and press satlink st5150 firmware link
If you want, I can search for available download links and recent user reports for "Satlink ST-5150 firmware" now. Do not power off the device or remove
And for a direct, tested download (as of the publication date of this article): satlink st5150 firmware link