MyAudio MA-C18x MP4 player

[od86]

Hi folks,

I bought a MyAudio MA-C18x player. It is based on some Actions Semiconductor chip, and I have some problems with the firmware downloader. It seems it cannot unpack the FW file, because of checksum errors.

---[ info ]--------------------------------------------------------------------
filename = 'dump.bin'
filetype = afi
md5 = 486ABCE23075ABC2748F92C5CF6FEFB6

---[ info:afi ]----------------------------------------------------------------
file id = 'AFI '
vendor id = 0x6977
product id = 0x6552
version = 1.0.00
date = 00/00/0000

+---filename---+ +---size---+ +-type-+ +---+ +--chksum--+
| BREC.BIN | | 16kb | | öA | | B | | A845B292 |
| FWIMAGE.FW | | 554.63mb | | | | I | | 92F89C47 |
| SYSINFO.BIN | | 192bytes | | | | | | 815C8A7D |
+--------------+ +----------+ +------+ +---+ +----------+

---[ info ]--------------------------------------------------------------------
filename = 'dump.bin.FWIMAGE.FW'
filetype = fw
md5 = 7E97D0CDDD2CAA13777CD5C431DFD910

---[ info:fw ]-----------------------------------------------------------------
invalid checksum, file header maybe damaged
file id = 0x0FF0AA55
vendor id = 0x10D6
product id = 0x1101
version = 1.0.00
date = 11/29/2010
info = 'SDK-ITEM/ACTIONSGongee.ZH'
manufacturer = 'Actions Semiconductor'
device name = 'Mutimedia Player'
usb attr = 'ACTIONS'
usb ident = 'HS USB FlashDisk'
usb rev = '2.00'
rtc rate = 0xB603
display contrast = 7
light time = 0
standby time = 0
sleep time = 0
language = simple chinese
replay mode = 0x00
online mode = 0x00
battery type = 1.5V alkaline
radio/fm support = yes

+---filename---+ +---size---+ +--chksum--+
| SYSCFG.SYS | | 3.25mb | | 432EE98C | <- invalid checksum
| SYSBNKA.SYS | | 6.5mb | | D4F7C884 | <- invalid checksum
| SYSBNKB.SYS | | 4.5mb | | E359EB74 | <- invalid checksum
| UD_SF641.DRV | | 2.25mb | | 0338B279 | <- invalid checksum
| UD_FF641.DRV | | 2.25mb | | 0338B279 | <- invalid checksum
| UD_FFSD.DRV | | 1.13mb | | 53BF0194 | <- invalid checksum
| FAT16_32.DRV | | 15.38mb | | D6AD5563 | <- invalid checksum
| MFS16_32.DRV | | 2.63mb | | 3A202CC4 | <- invalid checksum
| AUDIODEC.DSP | | 4.75mb | | D65F3BF0 | <- invalid checksum
| UD_SDMMC.DRV | | 2.38mb | | 4E71E3A1 | <- invalid checksum
| VM_NANF.DRV | | 896kb | | A3073184 | <- invalid checksum
| DRV_UH.DRV | | 3.75mb | | D381BA03 | <- invalid checksum
| CPASCI.UF | | 1.5mb | | 3C2B0662 | <- invalid checksum
| CP874.UF | | 3.5mb | | C587C700 | <- invalid checksum
| CP874.U | | 512bytes | | AA5E2225 | <- invalid checksum
| CP1250.UF | | 3.63mb | | 3E80E528 | <- invalid checksum
| CP1250.U | | 128kb | | 3B980211 | <- invalid checksum
| CP1251.UF | | 4.63mb | | 61711B84 | <- invalid checksum
| CP1251.U | | 128kb | | 3B980211 | <- invalid checksum
| CP1252.UF | | 3.13mb | | 36709436 | <- invalid checksum
| CP1252.U | | 128kb | | 3B980211 | <- invalid checksum
| CP1253.UF | | 3.75mb | | D381BA03 | <- invalid checksum
| CP1253.U | | 128kb | | 3B980211 | <- invalid checksum
| CP1254.UF | | 3.63mb | | 3E80E528 | <- invalid checksum
| CP1254.U | | 128kb | | 3B980211 | <- invalid checksum
| CP1255.UF | | 3.5mb | | C587C700 | <- invalid checksum
| CP1255.U | | 128kb | | 3B980211 | <- invalid checksum
| CP1256.UF | | 10.25mb | | 165D66A0 | <- invalid checksum
| CP1256.U | | 128kb | | 3B980211 | <- invalid checksum
| CP1257.UF | | 3.5mb | | C587C700 | <- invalid checksum
| CP1257.U | | 128kb | | 3B980211 | <- invalid checksum
| KY_HARD.DRV | | 1.13mb | | 53BF0194 | <- invalid checksum
| UI30.RES | | 7.88mb | | A5CDA11F | <- invalid checksum
| KCFG.AP | | 896kb | | A3073184 | <- invalid checksum
| MAIN.AP | | 3.38mb | | 4CB07C02 | <- invalid checksum
| MUSIC.AP | | 4.63mb | | BF7EF5F0 | <- invalid checksum
| VOICE.AP | | 4.50mb | | 82E36ABB | <- invalid checksum
| AMV.AP | | 11.38mb | | 457BB719 | <- invalid checksum
| FMRADIO.AP | | 5.25mb | | CFF8743B | <- invalid checksum
| PHOTO.AP | | 12.63mb | | C0EAFE03 | <- invalid checksum
| GAME.AP | | 4.38mb | | 49061791 | <- invalid checksum
| READER.AP | | 10.13mb | | 2B74A139 | <- invalid checksum
| STANDBY.AP | | 3.13mb | | 36709436 | <- invalid checksum
| USBDISK.AP | | 5mb | | 28DB0698 | <- invalid checksum
| RECORD.AP | | 9.63mb | | 845F5384 | <- invalid checksum
| SETTING.AP | | 9.13mb | | 7CF6DDC5 | <- invalid checksum
| FMCFG.INI | | 256kb | | 9CDFBCDC | <- invalid checksum
| FMCFGACT.INI | | 256kb | | 9CDFBCDC | <- invalid checksum
| DELTABLE.INI | | 640kb | | 20C1A0D3 | <- invalid checksum
| DRV_UI.DRV | | 6.88mb | | 83A8AA6C | <- invalid checksum
| ASCII.LIB | | 384kb | | 7D5850E0 | <- invalid checksum
| BOXGAME.BIN | | 512kb | | CF774498 | <- invalid checksum
| MP3DEC.DSP | | 4.25mb | | F6D37480 | <- invalid checksum
| LOGO.RES | | 10.63mb | | CC1695B3 | <- invalid checksum
| END.RES | | 10.63mb | | CC1695B3 | <- invalid checksum
| FWCFG.BIN | | 1mb | | 74DC930F | <- invalid checksum
| PSPCFG.BIN | | 128kb | | 3B980211 | <- invalid checksum
+--------------+ +----------+ +----------+

Some strange things:
- the dump.bin is over 550 Megs, but 99% is only 0xFF padding
- I saved the output of the firmware dumper via standard output piping, and in notepad++ it seems there are several 0x00 characters in the strings (file id = 'AFI0x00, and in the table right after that in the type column).

What can I do? I want to extract all files, and maybe upload them after some modifications (I got an idea about replacing the boxgame.bin with something else for example).

+ Another strange idea: the player definitely doesnt have an 1,5 V alkaline battery, it is based on some Li-Ion battery charged thru the USB port. What if I change the configuration accordingly? At this point, the player goes dead in 2 hours...