how to fix Lumia 520 "ERROR : Unable to find a bootable option. press any key to shutdown"

Lumia 520 "ERROR : Unable to find a bootable option

 

NOKIA LUMIA 520 REPAIR AND FIX :

Lumia 520 "ERROR : Unable to find a bootable option. press any key to shutdown

 This ia common trouble when upgrading WP 8.0 to 8.1, and this is
very easy to Fix, by EasyJTAG

 error like this :

1.) Solder only 4 wire : CMD, CLK, DAT0, and GND

 2.) Open Easyjtag Emmc tool, and connet usb directly to pcb as power of Vcc and vccq

   

Lumia 520 "ERROR : Unable to find a bootable option

 3. Click Emmc Tool, set eMMC Voltage to : 3,3v
Detect eMMC card, you will see in log "Emmc Permanent Write Protection : YES"
This is the problem, just click on Advanced Opt, select "SAMSUNG : remove write protection" and execute by Custom Operation -->

 4. Detect Emmc Card again to see the result, the trouble maker is remove Now

  Lumia 520 "ERROR : Unable to find a bootable option

 5. Assemble phone, and flash normally with any box u have.
And, just it, you just revive your phone back to live...

 you can download emmc pinout and from here : http://gsul.me/7SYE

video tutorial for all operation :