RegionChanger: KOS.fs_open broken?

[Dreamkey]

Hi SWAT,

First of all, thanks a lot for DreamShell, it's really a nice work!

So my problem: some times ago, I tried the Region Changer on my Dreamcast, but I failed the soldered joint and the Dreamcast boots with a grey logo and refuses to start games. I don't know if there is a physical damage or not.
Now I was able to revive it with the dual-BIOS mod with Link83's bios. It boots some games but more importantly DreamShell.

I plan to reflash the flash with Region Changer from DreamShell RC2 but it fails.
I made some changes in the main.lua, like this:

Код:

function RegionChanger:RestoreBackup()

    self:ChangeProgress(0.9);

    local file = "sd/flash.bin";
    local f = KOS.fs_open(file, KOS.O_RDONLY);
    self:ChangeProgress(0.7);
    local data = RC.flash_read_factory();
    self:ChangeProgress(0.5);

    if f > -1 then

But the progress bar is stuck to 90%.
And if I try to create a backup, the file got deleted but the bar stays at 10%.

If I open the console, I can see this error:

Код:

[...]/main.lua: error in function "fs_open'.
argument #2 is 'nil': 'number' expected.

What can I try? I'm willing to test anything you want
Thanks!