I've seen folk try to make those and it's pretty finicky. I won't write how to create such but will double check how you created one.
I had my BDP2500 repaired by Samsung 3 years ago. Failed outside of warranty (stopped powering on). As part of the repair they installed new firmware as repaired player had Pandora afterwards as well as Netflix.
However it also had a really annoying new Netflix bug where it crashes on the first frame of streaming a title. Doesn't effect all titles and usually works after reset and resuming title. Never did this before repair and PC on network streaming same title works fine.
For 3 years I've been trying to update via online update and player always says it's running current version. I contacted Samsung tech support several times during this time via text-chat and they always told me that if this is what player says, then there is no new firmware available.
Turns out I'm several versions back and there is an update available (off website) for download to install via USB or CD.
Problem is that neither of these methods work, I'm seeing the exact same problem as detailed in this earlier thread:
Official Samsung update CD doesn't work either.
I've dealt with Samsung tech support via phone now for hours, horribly frustrating experience. Full details can be found here if anyone cares:
Supervisor in tech support claimed the reason the online update no longer works is because (for technical difficulty/reasons) Samsung stopped uploading new firmware for this model to their online server. Not sure if this is actually true?
I have no idea why I can't update via USB or CD. I'm not paying to have it repaired, I'll just go buy a Roku.
If anyone knows a workaround that will allow the player to update the firmware I'd really appreciate hearing it. Thanks!