Can I use ISD for secure Channel?

Question

Hi all,
Forgive me if this is a silly question but I am still :o( baffled by what I can and what I cannot do between a host app and JC/OP applet, with SD and without SD
Can I do the following if this applet is associated with no SD except by default the ISD? Will this.mySD = OPSystem.getSecurityDomain(); return the ISD and will this unwrap commands sent to this applet if I send init-update255 and ext-auth mac as below?
public boolean select()
  this.mySD = OPSystem.getSecurityDomain();
  //The applet declines to be selected if the pin is blocked
  if (pin.getTriesRemaining() == 0)
     return false;
  else
     return true;
}// end of select method
public void deselect()
  // reset the pin value
  pin.reset();
}//end of deselect method
public void process(APDU apdu)
  byte [] buffer = apdu.getBuffer();
  if(selectingApplet())
       return;
  // code to execute if applet is not yet PERSONALIZED
  if (OPSystem.getCardContentState() != OPSystem.APPLET_PERSONALIZED)
      apdu.setIncomingAndReceive();
      switch (buffer[ISO7816.OFFSET_INS] & 0xff)
        case (byte) 0x50 : // VOP INITIALIZE UPDATE
           secureChannel[0] = mySD.openSecureChannel(apdu);
           apdu.setOutgoingAndSend(ISO7816.OFFSET_CDATA, buffer[ISO7816.OFFSET_LC]);
        break;
        case 0x82 : // VOP EXTERNAL AUTHENTICATE
     mySD.verifyExternalAuthenticate(secureChannel[0], apdu);
     break:
        case (byte) 0x02 :
                    OPSystem.getSecurityDomain().unwrap(secureChannel[0],apdu);
     // set key data: des-key will take 8 bytes even if we get more from
     // terminal
     desKey.setKey(buffer, ISO7816.OFFSET_CDATA);
     // finally set applet life cycle state to PERSONALIZED
     OPSystem.setCardContentState(OPSystem.APPLET_PERSONALIZED);
        break;
} // end switch
// else applet in PERSONALIZED state And the JCOP shell commands are
Card Manager AID   :  A000000003000000
Card Manager state :  OP_READY
    Application:  SELECTABLE (--------) "WalletTransact"
    Application:  SELECTABLE (--------) "WalletApplet" 
    Load File  :      LOADED (--------) A0000000620001   (java.lang)
    Load File  :      LOADED (--------) A0000000620101   (javacard.framework)
    Load File  :      LOADED (--------) A0000000620102   (javacard.security)
    Load File  :      LOADED (--------) A0000000620201   (javacardx.crypto)
    Load File  :      LOADED (--------) A0000000030000   (visa.openplatform)
    Load File  :      LOADED (--------) A000000167413001 (FIPS 140-2)
    Load File  :      LOADED (--------) A0000001320001   (org.javacardforum.javacard.biometry)
    Load File  :      LOADED (--------) A0000000035350   (Security Domain)
    Load File  :      LOADED (--------) A000000063       (PKCS15)
    Load File  :      LOADED (--------) "walletTransPack"
    Load File  :      LOADED (--------) "walletPackage"
select |WalletApplet => 00 A4 04 00 08 A0 00 00 00 03 00 00 00 00          ..............
(120 msec)
<= 6F 19 84 08 A0 00 00 00 03 00 00 00 A5 0D 9F 6E    o..............n
    06 40 51 40 35 21 14 9F 65 01 FF 90 00             .@Q@5!..e....
Status: No Error
init-update 255 => 80 50 00 00 08 F4 AE 67 6B 70 B8 FC D1 00          .P.....gkp....
(71 msec)
<= 00 00 40 35 12 34 56 78 98 76 FF 01 B0 59 32 FB    [email protected].
    DE 9A C4 E9 87 04 AD 32 03 41 36 54 90 00          .......2.A6T..
Status: No Error
ext-auth mac => 84 82 01 00 10 79 C6 EA 2E 0F 5F D9 BD FA C7 81    .....y...._.....
    36 47 71 8B 38                                     6Gq.8
(50 msec)
<= 90 00                                              ..
Status: No Error
send 00020000081122334455667788 => 04 02 00 00 10 11 22 33 44 55 66 77 88 15 BD B4    ......"3DUfw....
    FB 79 6A C0 71                                     .yj.q
(8322 msec)
<= 6E 00                                              n.
Status: CLA value not supported

Answer 1

well...you cannot use the firmware for befw11s4 v4 to be upgraded on befw11s4 v2 ..