This is how to fix error in Lumia WP8 "Unable To find a bootable option..."
Commonly caused by WP bug active on Samsung Chip.
Use ISP direct connection in UFI Box
The Procedure is simple :
▫ Connect only CMD, CLK, and DAT 0 (We will use VCC n VCCQ from the phone it self by plugged in USB ),
▫ Backup 512Mb user area,
▫ Format and Upgrade Firmware,
▫ Restore Backup, Assemble phone, and flash with any nokia tool you have.
In this latest update, we add Emmc ISP Picture Browser
So now you can add your own ISP Image collection directly to UFI Software.
This feature support search menu, auto scrolling, unlimited zoom out and zoom in..
https://www.youtube.com/watch?v=Zg_2urrQsGM