I've got a Russian Hyundai DVD player from my friend some time ago. Its model number is H-DVD5028.
However, there is just a small problem with it... its original remote control is missing. I do have an universal remote control (One For All, see photo), but I can't get it to work with it. I've used the 4-digit code for Hyundai DVD players from some big list of codes that came with the remote. My Daewoo CRT TV works with the universal remote, and I've actually got some of the functions work with the DVD player using an Arduino and IR LED. So I know that the receiver system on the player is not bad. However, I don't know the exact IR codes (NEC or SIRC codes, etc.) for this player.
I wonder if anyone here could help me with this?

Seems that a compatible remote called Soundmax TT-6011A can be bought in Russia for about ~$5. Though the cost of sending it to Finland will be grossly prohibitve...

This DVD player model cross-referenced to many others from Soundmax and Hyundai brands.

Have you tried these https://github.com/probonopd/irdb/blob/master/codes/Hyundai/Unknown_H-DVD5038N/0%2C251.csv

Not exact, but may be a at least partially compatible?