Backup cannot be restored on current device : Upgraded Hardware, both running 18.0.2 MR-2

Question

I wanted to upgrade my hardware from a big PC to a small networking unit. Read all reviews and made sure i am running the same EXACT firmware on both. I have months worth of backups and when i attempt to restore ANY of them to the NEW registered device, it states :Backup cannot be restored on this Device 
 
 I've verified all patterns are the same versions as well, what am i missing here?

Joe DeVito · Accepted Answer

I went on a 5 hour troubleshooting session till 2AM my time and i was able to figure out a work around. 
 - I reset my device back to factory defaults with 5 NICs (Onboard not disabled). Applied backup config and during the reload into the firmware, i disabled the NIC hoping it would reassign, i did not 
 - I shutdown fully three times and still the "LAN" zone was assign to Port5. Port5 however is not shown in "show network interfaces" and Port1 shows "UNBOUND" 
 - I attempted to rename the "Port5" interface to "Inside" in case it was holding the name and getting confused. Unfortunately after multiple shutdowns, this did not help 
 At this point, i started to focus more on the security zone "LAN" and not the interface because Sophos binds all of it's components on the security zone and not interface. 
 
 Here is how i resolved my issue (Which was the interface count as suggested by Ian) 
 I changed the "LAN" security zone's IP from .254 to .250. Reconnected over .250, Configured Port1 on the same "LAN" zone with .254. I was surprised the Firewall allowed me to configure the same zone and subnet on another interface but this allowed the security zone to stay active in 2 places. I then deleted Port5 and everything was still up and running, At this point i was left with Port1-4 configured, active and working. On the next reload, i disabled the on board NIC and after boot up, Port5 was gone leaving me with 4 Network interfaces!!!! (Port1-Port4) 
 Created a new backup, applied this backup to the NEW device and i am happy to say i am up and running with minimal configuration to complete this task. 
 
 It was a battle but the work around was not only informative, but i was able to complete the migration which in the end, was the point. 
 
 Thank you Ian. I work for an IT MSP so i appreciate not only your helpfulness, but were extremely responsive which is the hardest part of support. So again thank you!

Backup cannot be restored on current device : Upgraded Hardware, both running 18.0.2 MR-2

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