For ASRock J5040 - DS918+ is the best choice (not 923). You can now easily change the model and update the version using a simpler bootloader for beginners. At the same time you should also have the HW-transcoding option, which will allow you to process photos faster.   1) Download last release of bootloader Arc from here, write arc.img to the USB flash drive, start your NAS with this USB drive 2) Configure loader: DS918+, OK, build 64570, Yes, OK, OK, OK... OK (Boot Arc Loader no