Thousands of thanks to advancebox to flash nokia 620 successfully
 

Windows Phone 8 Flashing Started
Loading Flash Files Please Wait...

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Windows Phone 8 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...
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IMEI: 354636052260554
Version: 1.1.1.2
Product Code: 059R6J8
Module Code: 0205404

Boot Flash Mode Successful...

Phone Info Query Start...
Blocks Returned: 0x07 Blocks
Block ID 0x01 : 00241000
Block ID 0x02 : 00240000
Block ID 0x03 : 00E74000
Block ID 0x05 : Nokia.MSM8227.P5122.1.2
Block ID 0x0D : 0001
Block ID 0x0F : 0301010100000101FF
Block ID 0x10 : 0100030000
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 : SYNC + ASYNC
Query Flash App Information...
Flash App Information: 020109011000
UEFI App: FLASH APP
Flash App Protocol Version: 1.9
Flash App Implementation Version: 1.16
Query ROOT KEY HASH...
ROOT_KEY_HASH: 67131691EEDD1F38568C7FFAE284FB2621680FEAC833314467 E31DAA963D1467

Sending Image Signatures...
Image Signatures Accepted!
Erasing Data Partition...
Data Partition Erased Successfully
Preparing Buffers for DATA LOOP...
Allocating System RAM OK!
Start Sending DATA BLOCKS...
Finished Sending all DATA BLOCKS!
Exiting FLASH Mode via REBOOT...
Exit FLASH Mode Successful!

Flashing Done!
Total Flashing Time : 00:03:28