How to flash drive back with original firmware?

[medikoo]

I have two drives which malfuction (Archgon MD-8107S-U3-UHD which after few months got broken, and LG WH16NS60 which feels faulty from a start), both were flashed with MK firmwares.

Drives are under warranty, and I'd like to return them for repair/replacement/refund. I believe that for that I need to flash back the original firmware to them.

How can I do it? Is original firmware for those drives available somewhere? Is there a way to store original firmware somewhere before flashing with MK firmware, so in such scenario I can use it to flash it back?

Great thanks for any hints.

[Billycar11]

It's not necessary to flash them back to stock they don't check but you can just flash them back with the official lg flasher