You're looking for the firmware link for the Satlink ST5150. I understand that finding the right firmware for your device can be crucial for its performance and functionality. However, I must clarify that directly providing or asking for firmware links can sometimes lead to issues regarding copyright and intellectual property rights.
There is no single "official" permanent direct link for the Satlink ST-5150
– The update takes 2–3 minutes. The device may reboot once or twice. Do not remove the SD card or turn off the power.
Many legitimate retailers provide download links on their product description pages.