CH341a - Questions

[stj]

Re: CH341a - Questions

pin1 on the adapter is printed and the pad is square.

the socket on the programmer is used differently for 24series and 25series though.

[katfish]

Re: CH341a - Questions

Thanks for response.

Did verify ok after writing the BIN file. Same exact chips. It's been a long time since I've meddled in anything bios related. I seem to recall many moons ago that HP did some strange stuff with DMI I think?? But that's old stuff.

Maybe I'm putting the adapter board on backwards then. Wasn't able to read the chip at all with pin 1 to pin 1 on the YFT board. With pin 1 on pin 5, it read ok. Or did it? LoL ... I watched a video on some discussion about it. Host claimed it was incorrect.

Here's a pic ... should the adapter on top be rotated 180 degrees?

[stj]

Re: CH341a - Questions

First, I saw in a video that the pin numbers printed on the adapter board are incorrect (black model w/green adapter board). And pin 5 is supposed to be pin 1. Can anyone confirm this?

pcb marked "YFT246837" pin wiring is correct.

any documentation on what the jumper does? Comes default on pins 1-2.

the jumper switches between programming and usb2serial adapter.
good for hooking up to serial pins in stuff like routers.

I am working with a Winbond W25Q64FW from an HP 15-F010WM. I've managed to read the original chip ok, and saved the file. It was 8,192kb in size. But after successfully writing to a new chip, computer will not post. Put the old chip back on the mainboard, boots ok. Am I dealing with some HP nonsense ... or possibly a program limitation for the CH341?? I am using v1.29.

I downloaded the bios update from HP to see what was in it. Extracted the exe file ... and there are 5 different BIN files in it. All are 8,963kb in size. Too large according to the CH341 software. I assume there are five different ones for 5 different models and this one download covers the 5?? Just a guess.

Anyway ... looking for some input. Did a bit of google searching first. Didn't come up with much. I know there are a few of you here that are probably pretty familiar this device. Thanks.

that more difficult.
did you read the new chip to verify the data does match the original?
and is it exactly the same part number?
because if it is, they may be hiding security data in the one-time area. (read the datasheet)

[katfish]

Re: CH341a - Questions

Seems the jumper might be for different voltage choices.

And after some more reading, I need a bios dump, not the exe from HP support. Is copying the original chip to a BIN file with the programmer, not a dump? Not new to computer repairs ... but I am new to bios related meddling like this

[katfish]

First, I saw in a video that the pin numbers printed on the adapter board are incorrect (black model w/green adapter board). And pin 5 is supposed to be pin 1. Can anyone confirm this?

Also, any documentation on what the jumper does? Comes default on pins 1-2.

And last ... I am working with a Winbond W25Q64FW from an HP 15-F010WM. I've managed to read the original chip ok, and saved the file. It was 8,192kb in size. But after successfully writing to a new chip, computer will not post. Put the old chip back on the mainboard, boots ok. Am I dealing with some HP nonsense ... or possibly a program limitation for the CH341?? I am using v1.29.

I downloaded the bios update from HP to see what was in it. Extracted the exe file ... and there are 5 different BIN files in it. All are 8,963kb in size. Too large according to the CH341 software. I assume there are five different ones for 5 different models and this one download covers the 5?? Just a guess.

Anyway ... looking for some input. Did a bit of google searching first. Didn't come up with much. I know there are a few of you here that are probably pretty familiar this device. Thanks.