To be clear:
Fact 1. Upgrading using OFW will burn fuses.
Fact 2. As soon as u boot into OFW it will burn fuses if needed to the booted OFW.
Fact 3. Upgrading using choi will not burn fuses, unless fact 2 happens
Downgrading and restoring a backup of an older firmware is the same. Example, if u...