Flash write protected

[BSOD]

Hi! I have dead sony mp4 player (ex-4271), board: sp16-888 rev1.
And I try to recovery it. I trying to upload some firmwares (from this site), but mp3 update tool say: "Flash write protected"... :evil:
Please help me

Sorry for my bad English

[BSOD]

Yeah!
I was solve this problem!
My solution (if who need ) :
1. Download this manual: http://www.hynix.com/datasheet/pdf/flash/HY27UG(08_16)4G(2_D)M_Series(Rev.0.7).pdf
2. Find WP pin on memory chip
3. Connect this pin to red wire (with disconnected accumulator)
4. Use mp3 upgrade tool

(Really, now i have any problems with my mp4, but this is any question )

Sorry again for my bad english

[lattesurf]

BSOD , which red wire you are mentioning? This seems to be very useful as some members here sometime back had the same write protect message, but was not able to solve it completely.

[BSOD]

Accumulator in my player connected by two wires: black (-) & red (+).
I mentioning red wire, which connect accumulator with board.

[avionik99]

I think he is talking about the only red wire in these units and that being the positive wire from the battery.

Dave

[arviverona]

yup! if you doubt the reply, the further explanation is the WP is the write protect pin..and since the language of the digital mind is binary (1s and 0s)..so some digital ICs are Active low..means the answer is yes if connected to a low message (0s or negative ground '-') you must put a high message (red = positive, meaning 'no') to deactivate the write protect..

[BSOD]

.. and now I have another problem:
I was update my firmware, format flash, upload music.
First time player worked normally, but when i have try to upload other musuc, i have a error...
If I try to format flash again, i have "success" message from MP3 disk tool, but data on flash is no changing...
I try to put "1" signal to WP pin again and flash was successfully formated.....

What to do? I don't want to disassemble my player when i want to upload music

[lattesurf]

BSOD , was the firmware you flashed into the player from the forum? If so, it may not be fully compatible with your player.

[arviverona]

BSOD..after flashing your CHIP with a firmware..you must remove the wire again...it may cause an abnormal operation during normal use..like saving data...you just need to put the 1 signal when you are flashing the CHIP..if error on music still occurs..well it must be the firmware..