Olympus m:robe MR-100

[Bagder]

This mi4 decrypts fine with the same (default) key as the mi4 I host on my mi4 page.

[roolku]

This mi4 decrypts fine with the same (default) key as the mi4 I host on my mi4 page.

The problem seems to be the stored CRC32 checksum which is  73542bc3 according to the bootloader, whereas the calculated one is bcc9e837. Does your utility verify the checksum?

[Bagder]

(it's not my tool but...)

Hm, no it doesn't seem to check that. After decryption it just checks that the "magic numbers" are present and correct...! Nice catch! I wonder if this is a reason to skip the crc check or if there's some flaw somewhere. The CRC is a plain CRC32 algorithm and it has worked on so many mi4 files already...

[roolku]

scaramanga_goldengun,

do you know the history of the file? Is it the orignal that came with the unit or the result of an upgrade? Has it been 'hacked' in any way?

I have uploaded my OF file to http://www.roolku.pwp.blueyonder.co.uk/OF.mi4 if you want to give that a try - not sure though that there won't be  a problem with the support files (fonts, database etc).

[scaramanga_goldengun]

I upgraded it to the newest firmware, and in addition, changed the startup/charging/connected/etc. screens along with the original font. Does changing all of that stuff matter? It worked fine earlier, and it works fine with Rockbox.

[roolku]

I upgraded it to the newest firmware, and in addition, changed the startup/charging/connected/etc. screens along with the original font. Does changing all of that stuff matter? It worked fine earlier, and it works fine with Rockbox.

If by "changed" you mean you patched the mi4 file, then it would appear that the program you used for that purpose didn't adjust the checksum after the modification. While the original loader might not care about it, the rockbox bootloader will reject files where the checksum is incorrect. If you want to continue using that file, you will either adjust the CRC oder compile your own bootloader with the CRC check disabled.

[scaramanga_goldengun]

Okay, I downloaded your firmware and installed it, and it works, and what's weird is that all of the custom stuff remained (which I had earlier though was contained within the firmware, since it had to be done while upgrading the firmware). Thanks for your OF.mi4!

[Chronon]

This target is now supported.  Please direct installation questions to the proper Installation forum.  General questions about Rockbox running on the MR-100 should be directed to the main forums.

[Llorean]

Please stop unlocking this thread. It's a supported build now. Bug reports, etc, belong in the proper places now.

[markun]

moved support questions to separate threads:

http://forums.rockbox.org/index.php?topic=16097.0
http://forums.rockbox.org/index.php?topic=16098.0