Copy to now-unused slot from current slot

Jetson AGX XAVIER
L4T 32.7.2

The following is a log of the current situation.

Is it possible to copy the entire contents of slot B to slot A in this situation? Also, does such a command exist?

$ sudo  nvbootctrl dump-slots-info
Current bootloader slot: B
Active bootloader slot: B
magic:0x43424e00,             version: 5             features: 53             num_slots: 2
slot: 0,             priority: 0,             suffix: _a,             retry_count: 0,             boot_successful: 0
slot: 1,             priority: 15,             suffix: _b,             retry_count: 7,             boot_successful: 1

Not quite sure what it is, please provide more details of the issue or use case as reference. Thanks