When I booted on the system with the copied files I've ran fw_update and it is fine
Code:
# fw_update -v
fw_update: Path to firmware: http://firmware.openbsd.org/firmware/5.5/
fw_update: Updating firmware: radeondrm-firmware.
Update candidates: radeondrm-firmware-20131002p0 -> radeondrm-firmware-20131002p0 (ok)