SAMSUNG YH-920

[pyro_maniac]

I dont know how to upload or accsses the bootloader, but i wish i did. If anyone can help me i would be thankfull.

Anyway, here are the filename and a link to my current firmware that dosent allow FM support:
F_YH925J.mi4
http://rapidshare.com/files/277387558/F_YH925J.mi4.html

Before this firmware i think i had a firmware called FW_YH925.mi4
but i have no idea of the previous bootloaderversion. I updated it years ago.

You have got no rom file?

[Nichlas]

nope, dosent seem to bee one. If you want i can upload my file library.
The player works tho. Even if it refuses any tampering.

[pyro_maniac]

nope, dosent seem to bee one. If you want i can upload my file library.
The player works tho. Even if it refuses any tampering.

What revision of bootloader are you using?

[Nichlas]

It says 5.01 JN
I can connect the divice as UMS by holding FF during poweon, almost as the MPT version of H10.
But i cannot downgrade, or havent succeded yet.

[pyro_maniac]

Did you tried Rockbox on the device?

Here you get the bootloader from lowlight: klick
Rename your F_YH925J.mi4 to OF.mi4 and lowlights FW_YH925.mi4 to F_YH925J.mi4 and copy it into your SYSTEM directory.
Here your get Rockbox for your device: klick
Unpack this on your players root directory.

I know that dualboot will not work for you but we will see if your player loads Rockbox.

[Nichlas]

Sorry, cant get it to work.
I only get the error message:

= FIRMWARE REPAIR =
The divice firmware cant be loaded now.
please, connect to PC and repair firmware
with recovery utility.
It will be turned off

Maybe this Janus bootloader is incompatible with your new one.
If i new how to modify it or downgrade the player i would.
Isn't there a way to flash the internal memory?

Thanks for helping me.

--
OK ihave done some reading. It seems as if my mi4 file uses a different key then the one compiled here.
I tried to get this key with mi4code, i was unsuccessful.
I tried to do the same thing using your firmware and the BL_YH925.ROM as keyfile and that worked fine,
so i know i was doing something right.

I tried to extract the files from the Janus firmware update, in hope of finding my matching bootloader, with little success.
Do anyone have some idea of how to obtain the bootloader for my player in an easy way?
Or are there a way to get the mi4 key without it?

[lebellium]

lebellium: I've added compiled bootloaders to http://drop.io/low_light. If you test, make sure you get the right one. I suggest you don't overwrite the original firmware file, but rename it to OF.mi4, just in case.

Thank you so much! I got it! It works! 

[Mr Whippy]

oh wow Rockbox is available for YH-920! Brother will be happy he hates synching with WMP :-D

[pyro_maniac]

oh wow Rockbox is available for YH-920! Brother will be happy he hates synching with WMP :-D

Yeah but you need lowlights patch that is linked in a post before.

[Mr Whippy]

Is there anything I can do to help this along?

[pyro_maniac]

Is there anything I can do to help this along?

Keymaps need improvements. The file on the tracker is still open for this.

[lebellium]

All is working fine for me. Just one problem: Every time I connect it to the computer as rockboxed, I have to format the device

[Mr Whippy]

Awesome  No need for syncing with god awful, slow napster software.

Just one thing that could do with tweaking- volume control. I've plugged IEM's and Grado phones and only can start to hear music when the gradient is quite high up, say last 10% visible actually is the level between no music and loud. I'll get specific -dB values

[Nichlas]

Great that Rockbox is working fore u guys. And super work from the devs!
I however have not had that much luck.
I have tried to find the bootloader for my F_YH925J.mi4 version of the firmware.
As i can tell it is not easely extracted from the device itself.
I have tried to extract it from the firmwareupgrade_for_MTP.exe.
I think that i have located the file, but it seems to bee encrypted.
If anyone could decrypt it i would be extreamly happy.
Or describe wath encryotion type that is beeing used.

here is the file
http://rapidshare.com/files/279506541/DATAFILES_181.res.html

[pyro_maniac]

Great that Rockbox is working fore u guys. And super work from the devs!
I however have not had that much luck.
I have tried to find the bootloader for my F_YH925J.mi4 version of the firmware.
As i can tell it is not easely extracted from the device itself.
I have tried to extract it from the firmwareupgrade_for_MTP.exe.
I think that i have located the file, but it seems to bee encrypted.
If anyone could decrypt it i would be extreamly happy.
Or describe wath encryotion type that is beeing used.

here is the file
http://rapidshare.com/files/279506541/DATAFILES_181.res.html

Maybe you could look here and try the rollback for mtp.