Thema: HD 51 flashing guide request

Dears,

Please guide me to flash openatv-6.4 on my HD51 , why there are 2 files?

do i have to extract both files in to the same 'USB directory (hd51) ' for flashing?

openatv-6.4-mutant51-20200523_usb.zip
openatv-6.4-mutant51-20200523_recovery_emmc.zip

Thanks in Advance,
GAP

recovery_emmc destroys all partitions and flash the new Image in the first partition, , usb (should be better named multiboot) are for flashing partitions separetly i.e. manually with ofgwrite or with the backup plugin