Hi,
Here is the tips how to write SD Boot Recovery :
- Please use branded HS SD card, at least class 10 with capacity equal to or greater than the default emmc.
- Open UFI eMMC ToolBox with Run as Administrator
- Always make checklist to Re-partition and SD Boot Recovery
- You can use Samsung repair firmware in Factory Image tab with pit file, or directly write userarea dump file in Program tab.
Gud Luck