I have a T2600G-18TS switch which is stuck in Boot Menu after reboot.

I did not change any settings or image or configuration, I only copied the startup-configuration to tftp server: 

Switch#copy startup-config tftp ip-address 192.168.0.115 filename Switch_bckp
Start to backup user config file......
Backup user config file OK.

After reboot I got this message:
 

Begin to startup system, please wait a moment...
ERROR: can't get kernel image!
                *********************************************
                *         TP-LINK  BOOTUTIL(v1.0.0)         *
                *********************************************
                Copyright (c) 2016 TP-LINK Tech. Co., Ltd
                Create Date: Oct 25 2016 - 09:06:37

   Boot Menu
0  - Print this boot menu
1  - Reboot
2  - Reset
3  - Start
4  - Activate Backup Image
5  - Display image(s) info
6  - Password recovery

Enter your choice(0-6)
 

tplink> 5
Images in system:
index  Attribute  Size        Filename
-----  ---------  ----------  ---------------------
1      (b)        10485760    image1.bin
2      (*)        10485760    image2.bin
-----  ---------  ----------  ---------------------

(*) - with the Startup attribute
(b) - with the Backup attribute

I tried to Active Backup Image, then Start, and Reboot, and just Reset the switch, but it always came back here with the Error message.
Unfortunately I did not find any solution about this problem. Can anybody have any idea how could I solve this issue?
Thank you for your answers in advance.