HELP! FortiGate 200B can't boot

I have a FGT 200B, original firmware version is 4.3.15, and I tried to upgrade its firmware.

My upgrade steps as follow:

1.turn off the power

2.turn on the power, and go into the boot menu

3.Press F to format boot device

4.Upload 4.3.16 image by using tftp

5.when uploading is done, set as default image to boot.

And then I saw the console message as follow:

Programming the boot device now. ..................................................................

/src/device/usb2/usb.c: 342: usb_start_wait_urb status!=0(-32)

ERROR: Bulk read CSW ret = -32 ERROR: ll_read_block( 5e08, 38c10000, e081, 10) = -1 ../src/device/usb2/usb.c: 342: usb_start_wait_urb status!=0(-32)

I retried formating boot device and uploading 4.3.16 image, or uploading 4.3.15 image,

and no matter I set the upload image as Default/Backup/Run image,

it still doesn't work.

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I searched the error message on google, and found one post having the same problem, post link as follow:

https://community.spiceworks.com/topic/545014-help-fortigate-80c-wont-boot

so I searched the FGT200B format image on the internet, but didn't get any result;

and I tried to upload the FGT80C format image to my FGT200B, but the image was not compatible with FGT200B

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Does anyone can help me ?

※Attachment file：

console message log