ROM Hack Question Restoring Switch backup with older firmaware, safe?

[Canna]

No i

I am chill. I'm always chill ..its you that's seems someone shit in your oatmeal this morning.. kid. Not moderating I just like to read and understand whats actually being asked.

In fact im having a great day

I answered his question he got a answer then you said my answer would not help him
Thats your opinion and your wrong.
If he wishes to load back to 4.0 he will have to load via the guide..
If he wishes to restore his 5.1.0 backup he can with a restore.

I answered with options hope thats cleared that up for you