I've got an "MP-683EGCF MVMAIN 05/09/09" from a colleague to check it, because it behaved weired.
Under the battery was a sticker with a 64MB on it. On windows there was a 64MB partition but additional a not formated 128MB partition. Some mp3 testfiles it did play, but audiobook files with so about 58MB it did not.
So i thought repartition and reformat would be a bright idea. After repartitioning it showed me only so about 26Mbyte which I did whith linux fdisk. I could change sector, cylinder and head size but only to a max of 26Mbyte.
So I thought, I messed it up. Maybe a firmware flash would do the trick. I choosed "MP-683EGCFMV1 MAIN 05-05-09 ATJ2051 (FULL).bin" and it fragged the player!
So I had to remove the board to shorten the pins on the NAND Ram. And there it was: "hynix KOR / HY27USO8561A"
That is a 256MBit Flash NAND wich is around 30,517 Mbyte (31250 KByte) of capacity.
No wonder it behaved weird! It is only 30MB and that firmware in combination with a modified partitiontable tricked your computer in believing its bigger. In my case they did something wrong with that second partition so a second driveletter showed up. Maybe it's just another trick to fool the customer: You wonder why there is so much unpartitioned space (128MB instead of 64 would be cool, wouldn't it?) repartition and end up with 32MB. Most people would blame themselfs in doing so. Who will
open it, and check the memory NAND chip out?
The Chip used is a "ATJ2051W / F4159A8 140".
I reanimated the player with the "atj2051.7z" firmware. It works, but that one had FM-radio support. I joined that firmware with my dumped firmware. And got rid of that not present FM-radio.
There is in both firmwares a "RPL" Icon, which should be the playlist option. It showed "No files!" when selected and the device had music on it which plays it in "MSC"-mode. On some screenshots in another thread there were submenuitems like "Artist", "Genre" and so on under it. But I get instant that "No files!" message.
The phonebook works and is in 2.0 format. There is one
Textmode and lyrics are not yet checked.
In the way checking it, I found something out about the differnt
mp3: It plays everthing I tested. CBR, ABR and VBR on differnt bitrates with 22khz and 44khz sampling.
wma: I tested only wma9 without DRM. It worked with CBR, twopass CBR, twopass VBR and quality based VBR.
ogg: This files are not show in the "MSC"-playmode, so there is no way to try to play them.
That player was an advertising gift but they were not shure from whom they have got it. I will ask around and maybe I find out. This gift is the worst possible giveaway. A broken thing (cannot play 50% of transmitted mp3 in faked status) which cost you hours to find out the device itself is broken and not yourself had messed up with your mp3 encoding settings or something the like. More interessting: advertising gifts are bought in big numbers and so its real money. I think they will be interessted in getting informed, they gave away to their dear customers broken and anoying stuff. Stuff for which they payed lots of money. You don't buy one advertising gift! You be fifty or more. And thats real money. Looks like lawyer stuff for me ...