Hi, my board has a winbond 25q128fwsq & I was thinking VCC to GND may do the trick. Although I'd prefer to find two solder pads on the board to bridge with all power removed to clear reset cmos to default values. Any advice would be helpful.

 

What might this pin be?

 

Thank you. So do I connect RESET pin to GND? Otherwise I'd prefer to find two solder pads to connect to reset with a screw driver or metallic object instead, is possible?

 

Read the datasheet of the chip. RST needs to be connected to GND for at least a second while the chip is powered up. Be careful what you do because in my opinion you would have to first break the SPI_HOLD_ROM signal, because you will short circuit that voltage to ground wherever it comes from.

 

@meth What if i don't have the resources to perform that operation. What are some other methods to reset my chip via reset solder pads on the board possibly? Pulling battery alone is insufficient, takes too long & didn't seem to do anything after 30min for me.
https://www.mediafire.com/file/glpz0t6l6mcl4lz/Dell_G5_SE_5505_Laptop_Schematic.zip/file

 

What are you trying to achieve actually? If you want to re-flash the whole chip I think it would be best to desolder it from the board, preform the operations you want and solder it again. Because there you also have pin 3 which is write protect, and if you try to somehow flash the chip you will need to interrupt that signal too because I assume in normal operation the write protection is active.

Edit: I am not aware if the motherboard has maybe some jumpers/switches so you can "isolate" the chip and do a flashing operation.

Edit #2: Apparently you can do this using USB stick with the new content through the BIOS menu itself.

 

@meth Well right now I previously successfully CH341A flashed it using SNANDer on github & i was having issues accessing and flashing the VBIOS chip in windows via amdvbflash (Not CH341A, I will do that on the 22nd). So I decided to flash stock bios & now I cannot get into the BIOS just a black screen after F2 at boot time.

So I don't have an opportunity to CH341A again until the 22nd & I may need to reset after invalid choice selected in bios since i modded the bios for full cbs pbs menu unlock. Lots of options.

Basically I need a Quick & Easy way to reset to default settings in case of failed boot from fooling around with bios settings.

Can I short C2501 to reset the CMOS?

 

Edit #2: Apparently you can do this using USB stick with the new content through the BIOS menu itself.

I tried and it only accepts the original .exe from dell website. I need to flash modded bios, and if you know a way to do it without CH341A, I'm all ears. It's Insyde BIOS.

 

If you could isolate the chip from the board (desolder it) it would be easier in my opinion. If the chip is on the board I do not know how to set the signals to the correct logic level so you can reset and reflash the chip. Maybe someone else on the forum has experience how to do this on-board.

 

First, this is a Flash memory chip not a CMOS battery-backed RAM. DO NOT SHORT VCC to GND, you will be sorry. Second you seem to be asking about erasing/clearing the Flash memory, not resetting. For this device, the RESET pin (if you have the appropriate version part) is for resetting the SPI controller and has absolutely no effect on the Flash memory contents. If your goal is to erase the Flash then the part needs to be removed from the board and some form of programmer needs to be used. Of course, whatever device is currently driving the SPI interface could perform erase operations similar to write operations, but that requires software,