[burn bootloader]: how to skip the fuse/lock phase

As you know, Burn bootloader has two phase:
phase 1: burn fuse bit and/or unlock
phase 2: burn flash and lock

My question is, how to skip phase1 and just do flash programming while [burn bootloader]

Best Regards

If you don't unlock, how do you intend to then write?

Infect, I try to port another hardware platform, which has no such fuse/lock function.