Create and write LDR in Seagate F3 with MRT Pro data recovery tool.
Create LDR: backup LDR from good disk (universal firmware, has slight difference with factory firmware)
Write LDR: write LDR to disk
This operation is used for updating firmware. It can be used to repair firmware modules.

Download link of video tutorial: https://us.mrtlab.com/video/stcrldrwldr.rar