[Help] Rom Write Protected

[MarcoMjet]

hi all...
i've a chinese tablet (THD PX1 Based)
i've the 3G card locked by bios
i've download serg008bios but my bios is write protect
after a lot of searches i've found the problem:
my bios is a "MIXC 25l8005 CMOS SERIAL FLASH"
this is the datasheet
http://www.datasheet.co.kr/datasheet-htm...C.pdf.html
my request is:
according to datasheet the 3 pin is WP# (write protection) there is a way to enable write? maybe with a bridge? desolder pin? thanks

[MarcoMjet]

http://notebookschematic.com/wp-content/...04/PX1.png

motherboard schematic

[moral hazard]

I didn't look at your datasheets, but the first thing I would do is try connect pin 3 to GND with a resistor (10K maybe).

[MarcoMjet]

i've tried with screwdriver but no luck now i'm tring with a resistor
another problem is that i've two 25l8005...

---

correct datasheet download link

[MarcoMjet]

10k resistor fail....

[MarcoMjet]

i've desolder WP# no luck
i could try to do a brigde from WP# and VCC??

[akuma6099]

i've desolder WP# no luck
i could try to do a brigde from WP# and VCC??

Most SPI Flash has WP and HOLD set as Active Low. Which means if you want a HOLD condition, 0=HOLD or WP set, 0=Protected. You would tie VCC into WP to allow the WREN command. On this particular chip you also have a (Status_Reg_Write_Disable)SRWD bit which acts as a software type protection. If WP=1=VCC then you can use (Write_Status_Reg)WRSR to set the SRWD bit. Check table 4 in your datasheet. Typically these chips are pulled from circuit and programmed externally.

[MarcoMjet]

i've desolder WP# no luck
i could try to do a brigde from WP# and VCC??

Most SPI Flash has WP and HOLD set as Active Low. Which means if you want a HOLD condition, 0=HOLD or WP set, 0=Protected. You would tie VCC into WP to allow the WREN command. On this particular chip you also have a (Status_Reg_Write_Disable)SRWD bit which acts as a software type protection. If WP=1=VCC then you can use (Write_Status_Reg)WRSR to set the SRWD bit. Check table 4 in your datasheet. Typically these chips are pulled from circuit and programmed externally.

thank u man, i'll try to make a bridge from VCC to WP with a 10/100 k resistor, then if doens't work i'll buy a programmer... like this
http://www.ebay.com/itm/24-EEPROM-25-SPI-FLASH-BIOS-TTL-USB-Programmer-ATMEL-WINBOND-EON-ST-24-25-Series-/150919158857?pt=LH_DefaultDomain_0&hash=item23237b9c49

[akuma6099]

I've seen that programmer around but never tried it. Personally, I use the BlackCatUSB. It had a name change to FlashCatUSB. If your willing to spend $30.00 it is well worth it. Havn't ran into a chip it doesn't support yet. Always being updated. Easy UI. Includes custom scripting support for unknown chips. supports a few NANDS and JTAG protocol.

http://www.embeddedcomputers.net/products/FlashcatUSB/

I would also get a Pomona 5250 8-pin SOIC Test clip unless you have a socket or breakout board already. And a Bus Pirate Cable to hook Flashcat->Test Clip. A couple jumpers for HOLD and WP.....