Hardware Which wiiu set should I buy based on its serial number?

[sonatakk]

I saw 4 serial number of wii u buddle set, and each one is not opened. Which one is possibly lower than 5.4.0?
1. MK8 Pre-Installed: FW115XXXXXXX
2. MK8 Pre-Installed: FW713XXXXXXX
3. MK8 Pre-Installed: FW412XXXXXXX
4. Super smash bros & splatoon buddle set: FW114XXXXXXX
Why Super smash bros splatoon deluxe set's firmware is lower than MK8 Pre-Installed set? It's pretty odd. I thought the lower FW is safer.
Thanks

 

[henn64]

I saw 4 serial number of wii u buddle set, and each one is not opened. Which one is possibly lower than 5.4.0?
1. MK8 Pre-Installed: FW115XXXXXXX
2. MK8 Pre-Installed: FW713XXXXXXX
3. MK8 Pre-Installed: FW412XXXXXXX
4. Super smash bros & splatoon buddle set: FW114XXXXXXX
Why Super smash bros splatoon deluxe set's firmware is lower than MK8 Pre-Installed set? It's pretty odd. I thought the lower FW is safer.
Thanks

Smash/Splat Deluxe Set is apparently 5.4.0. The serial number =/= fw version 100% of the time.