Unable to find bootable option

Lumia 520 at boot show "unable to find a bootable option"
It is fixable only via jtag?

Windows Phone 8/8.1/10 Flashing Started
Loading Flash Files Please Wait…

[DEAD BOOT REPAIR via USB is SUPPORTED]

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Windows Phone 8/8.1/10 Lumia Flasher
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If the Phone is ALIVE
1. Power On the Phone and Connect it to the USB Port

If the Phone is DEAD
1. Connect Phone to the USB Port
2. Press and Hold the VOLUME DOWN and POWER Buttons
3. Wait until the Phone Vibrates Shortly…
4. Stop Pressing the Buttons…

If the Phone is DEAD BOOT
1. Connect Phone to the USB Port
2. Install Correct Drivers:
"Nokia Emergency Connectivity" Located at:

D:\Program Files\AdvanceBox Turbo Flasher\Driver\NOKIA_X2_USB_DRIVERS\
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Nokia Phone Info Mode Initiated…
Please wait upto 15 Seconds for SW Reset
IMEI: 35728705xxxxxx
Version: 1.1.1.3
Product Code: 059S2J1
Module Code: 0205435

Continuing Previous Boot…
Please wait upto 30 Seconds for Boot Re-entry

Boot Flash Mode Successful…
Buffers Flushed OK…

Phone Info Query Start…
Blocks Returned: 0x07 Blocks
Block ID 0x01 : 00241000
Block ID 0x02 : 00240000
Block ID 0x03 : 00E90000
Block ID 0x05 : Nokia.MSM8227.P6036.1.2
Block ID 0x0D : 0001
Block ID 0x0F : 0301010100000101FF
Block ID 0x10 : 0100130000
Checking SD Card Size…
Card Size: 0x00000000
Checking Platform Security Status…
Platform Secure Boot Status: Active
Secure FFU EFUSE Status: Active
Debug Status: Active
RDC Status: Not Active
Authentication Status: Not Active
UEFI Secure Boot Status: Active
Checking Secure FFU Mode…
Secure FFU Mode :
Query Flash App Information…
Flash App Information: 02010F011C00
UEFI App: FLASH APP
Flash App Protocol Version: 1.15
Flash App Implementation Version: 1.28
Query ROOT KEY HASH…
ROOT_KEY_HASH: F771E62AF89994064F77CD3BC16829503BDF9A3D506D3FACEC AEF3F808C868FD
Query PUBLIC ID…
PUBLIC_ID: 9FE6D1E2469D69CFDB352CFEC4D8D990FC02BD75
Query eMMC Info…
EMMC Manufacture ID: SAMSUNG
EMMC Product SN : 2E024BB5
EMMC_SIZE: 8 Gigabytes
Query Battery Charge Status…
BATTERY CHARGE_STATUS: 14%

Sending Image Signatures…
ERROR: Flash Signature Block REJECTED! (0x11068000000E00000000)
This Flash File is NOT COMPATIBLE with this Phone.
ERROR: Flashing Failed!