Есть 2 циски PIX-515E FO

sh ver
Cisco PIX Firewall Version 6.3(5)
Cisco PIX Device Manager Version 3.0(4)

Compiled on Thu 04-Aug-05 21:40 by morlee

pixfirewall up 17 days 4 hours

Hardware:   PIX-515E, 128 MB RAM, CPU Pentium II 433 MHz
Flash E28F128J3 @ 0x300, 16MB
BIOS Flash AM29F400B @ 0xfffd8000, 32KB

Encryption hardware device : VAC+ (Crypto5823 revision 0x1)
0: ethernet0: address is 0015.f987.9563, irq 10
1: ethernet1: address is 0015.f987.9564, irq 11
2: ethernet2: address is 000d.8811.0760, irq 11
3: ethernet3: address is 000d.8811.0761, irq 10
4: ethernet4: address is 000d.8811.0762, irq 9
5: ethernet5: address is 000d.8811.0763, irq 5
Licensed Features:
Failover:                    Enabled
VPN-DES:                     Enabled
VPN-3DES-AES:                Disabled
Maximum Physical Interfaces: 6
Maximum Interfaces:          10
Cut-through Proxy:           Enabled
Guards:                      Enabled
URL-filtering:               Enabled
Inside Hosts:                Unlimited
Throughput:                  Unlimited
IKE peers:                   Unlimited

This PIX has an Unrestricted (UR) license

Вопрс: можно ли залить Cisco PIX Firewall версии 7 и выше без смены ключей (PAK)?
и как это вообще делается ?