Upgrade Cisco 2950 IOS

Hello,

I would upgrade the 2950 IOS from c2950-i6q4l2-mz.121-11.EA1.bin to c2950-i6q4l2-mz.121-22.EA8a.bin.
Whereas it doesn't work, when I reload my switch there is my old IOS.

This is what I do:
- copy the bin file from my TFTP Server to the switch
- when I do show flash i see the both IOS
- switch(config)#boot system c2950-i6q4l2-mz.121-22.EA8a.bin
- copy running-config startup-config
- reload

When I type show boot, I have c2950-i6q4l2-mz.121-22.EA8a.bin (the new IOS)

When I reload I have the code below.

What can I do to upgrade my IOS correctly, where is my error

Thanks in advance to an answer to my issue

Proceed with reload? [confirm]                              
 
00:02:44: %SYS-5-RELOAD: Reload requested                                         
C2950 Boot Loader (C2950-HBOOT-M) Version 12.1(11r)EA1, RELEASE SOFTWARE (fc1)                                                                             
Compiled Mon 22-Jul-02 17:18 by antonino                                        
WS-C2950G-24-EI starting...                           
Base ethernet MAC Address: 00:0a:f4:39:b0:80                                            
Xmodem file system is available.                                
Initializing Flash...                     
flashfs[0]: 17 files, 2 directories                                   
flashfs[0]: 0 orphaned files, 0 orphaned directories                                                    
flashfs[0]: Total bytes: 7741440                                
flashfs[0]: Bytes used: 7286272                               
flashfs[0]: Bytes available: 455168                                   
flashfs[0]: flashfs fsck took 9 second                                    
...done initializing flash.                           
Boot Sector Filesystem (bs:) installed, fsid: 3                                               
Parameter Block Filesystem (pb:) installed, fsid: 4                                                   
Loading "c2950-i6q4l2-mz.121-22.EA8a.bin"...c2950-i6q4l2-mz.121-22.EA8a.bin: per                                                                                
mission denied              
 
Error loading "c2950-i6q4l2-mz.121-22.EA8a.bin"                                               
 
Interrupt within 5 seconds to abort boot process.                                                 
Loading "flash:/c2950-i6q4l2-mz.121-9.EA1.bin"...###############################                                                                                
################################################################################                                                                                
################################################################################                                                                                
##########################################################################                                                                          
File "flash:/c2950-i6q4l2-mz.121-9.EA1.bin" uncompressed and installed, entry po                                                                                
int: 0x80010000               
executing...

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