HA between a Cisco ASA 5520 and a Cisco ASA 5525-X

Hi all!
we have a couple of Cisco ASA 5520 running 8.4(3) software, and we want to improve throughput changing them with a couple of Cisco ASA 5525-X. Since software is theorically compatible, we are not going to upgrade it right now.
We don't want to stop service, so we are thinking about switching off backup 5520 firewall, change it with a 5525-X and balance service to that one while we change the other 5520 fw. So the question is, has someone tried to make an active-pasive cluster with both technologies, Cisco ASA an Cisco ASA-X firewalls? We were said that it should be theorically compatible, but we'd like to know if someone tried before.
Best regards for all,

You cannot make a 5520 establish failover with the mate being a 5525-X.
1. The configuration guide (here) states:
The two units in a failover configuration must be the same model, have the same number and types of interfaces, the same SSMs installed (if any), and the same RAM installed.
2. A 5525-X requires 8.6 software. 8.6 does not support non-X series ASAs. (Reference) Even if you wait until 9.0 is available (next month) for both you still fail on the model and RAM (X series has much more than the 5520) checks noted above.

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                 Port        109 (GigabitEthernet3/0/1)
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      Bridge ID  Priority    49264  (priority 49152 sys-id-ext 112)
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    Fa2/0/46         Desg FWD 3019      128.104  P2p
    Fa1/0/46         Desg FWD 3019      128.50   P2p
    Gi3/0/1          Root FWD 3004      128.109  P2p
    Fa3/0/46         Desg FWD 3019      128.158  P2p
    Fa3/0/47         Desg FWD 3100      128.159  P2p
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    =====================================================
    2- Some more details information which might be helpfull to you.
    http://www.cisco.com/en/US/products/hw/switches/ps663/products_tech_note09186a
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    Problem
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    Inayath
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    Message was edited by: J. Christopher Edwards

    I think you don't get it
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    Hi,
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    D  *** ERROR =>   id  4 [diagext.c    1026]       <br>                                      
    D  *** ERROR =>   sid 23 [diagext.c    1027]            <br>                                
    D  *** ERROR => invalid APPL header [diagext.c    1024]      <br>                           
    D  *** ERROR =>       16 [diagext.c    1025]           <br>                                 
    D  *** ERROR =>   id  4 [diagext.c    1026]      <br>                                       
    D  *** ERROR =>   sid 22 [diagext.c    1027]         <br>                                   
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    N  dy_signi_ext: SSO TICKET logon (client 300)        <br>                                  
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    N  RunningCompatibly said: I'm >= 46C.      <br>                                            
    N  mySAP: Got the following SSF Params:       <br>                                          
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    N         EncrAlg=DES-CBC     <br>                                                          
    N         Format =PKCS7       <br>                                                          
    N         Toolkit =           <br>                                                          
    N         HashAlg =SHA1           <br>                                                      
    N         Profile =/usr/sap/TRN/DVEBMGS30/sec/SAPSYS.pse    <br>                            
    N         PAB =/usr/sap/TRN/DVEBMGS30/sec/SAPSYS.pse       <br>                             
    N  Got the codepage 6300.              <br>                                                 
    N  Got ticket (head) AjExMDAgAAtwb3J0YWw6c2Zvb4gAE2Jhc2ljYXV0. Length = 524.             <br>
    N  Got content client = 000.             <br>                                               
    N  Got content sysid = PEP     .   <br>                                                     
    N  Got date 200910151442 from ticket.          <br>                                         
    N  Cur time = 200910151515.        <br>                                                     
    N  Computing validity in hours.       <br>                                                  
    N  Computing validity in minutes.       <br>                                                
    N  CurTime_t = 1255706100, CreTime_t = 1255704120        <br>                               
    N  validity: 28800, difference:   1980.000.      <br>                                       
    N  MskiValidateTicket returns 0.             <br>                                           
    N  DyISigni: client=300, user=SFOO        , lang=E, access=A, auth=T           <br>         
    N  usrexist: effective authentification method: mySAP.com logon ticket       <br>           
    N  password logon is generally enabled (default)                 <br>    
    N  password change not required (expiration period=0 / days gone=46)  <br>
    N  usrexist: update logon timestamp (M)                      <br>        
    N  save user time zone = >PST   < into spa    <br>                       
    N  syssigni: SSO logon data released (roll area)    <br>                 
    N  syssigni: detected workplace context           <br>                   
    N  DyISignR: return code=0 (see note 320991)  <br><br>                       
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    Edited by: Steven Foo on Oct 15, 2009 5:19 PM

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