System76 · Laptop
Adder Pro (addp6)
addp6
F2Hold
BIOS / UEFI setupHold while powering on to open firmware setup.
F7Hold
Boot device optionsHold while powering on, then choose the preferred boot device.
Manufacturer documented · checked
The exact-model specification documents this laptop generation and its non-open firmware; System76's current key table maps most proprietary-firmware laptops to F2 and F7.