Re: RCUnlocker
I don't think it's resin between the IC and the board.. the Winbond WSON8 chips have a big fat ground plane in the middle of the chip that mates with a big copper land on the PCB, and that when soldered together takes a big quantity of heat to melt.
Advice seems to be, not to worry too much about temperature and I must admit the one chip I've tried desoldering, I thought with 100% certainty I'd fried. But it turned out to read fine.
A few people have posted that appropriate heat from the underside of the PCB, right under...
dualtrace
New Member
Last Activity: 08-23-2022, 05:20 PM
Joined: 01-08-2022
Location: Lancashire
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Re: RCUnlocker
Not listed in my linux package manager. I'll flip to Windows & try it there.
EDIT - Used Winrar on Windows instead of Ark on Linux, everything extracted just fine. Thanks :-)Leave a comment:
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Re: RCUnlocker
I seem to be having a problem un-rar'ing the download. I can open the file with Ark and LXQt File Archiver, and see various files and folders, but it won't extract completely.
I can manually 'dig in' and pull some files out to the Desktop individually, including RCUnlocker.exe, but many files inside the /lib/encodings/ folder give rise to errors if any attempt to move/extract them is made e.g. 'Failed to execute the command'. 'Extraction failed, make sure that enough space is available'.
A few files that seem to give rise to the issue: big5hkscs,pyc,...Leave a comment:
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Re: HP BIOS unlock tool
Excellent info thanks.
I had wondered what would happen if one left a bit of chip quik on the pads - but sounds like that pitfall can easy happen with using the bismuth solder too.
Noticed when practicing, the hot air needs to blow much hotter than the listed melting points. Especially when there's big areas of copper track / nearby heat sinkery. I was only just managing to cleanly desolder WSON8 6X5's off scrap boards at around 320 deg measured by a thermocouple touching the chip, sometimes even higher.
On the...Leave a comment:
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Re: HP BIOS unlock tool
For those wishing to try desoldering / soldering their flash chips, here is some research I did into the sort of soldering temperatures these chips are ok with.
[code]
Key temps and times for e.g. Winbond 128 SPI:
85°C - max operating temp of SPI chip
150°C - max storage temp of SPI chip
??? - SPI chip max soldering temp "compliant with JEDEC Standard J-STD-20C"
138°C - Melting point of 42/58 tin/bismuth solder eg 'Mechanic V4B45'
183°C - Melting point of 63/37 lead/tin solder
190°C -...Last edited by dualtrace; 01-19-2022, 07:40 PM.Leave a comment:
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Re: HP BIOS unlock tool
Not quite sure what the difference is between B and J versions of the chip but they're both 16M 3V. Maybe B is just newer.
[url]https://pdf1.alldatasheet.com/datasheet-pdf/view/443805/WINBOND/W25Q128BV.html[/url]
Maybe if you did both chips, even if it did try to reload from the second chip, you'd have de-passworded that one too..
I'm no expert. Probably best to wait until someone more knowledgeable than I comes along & suggests what's safe to do.
Clips do seem to have a reputation for causing problems...Leave a comment:
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Re: HP BIOS unlock tool
Did you desolder the chip for reading / writing or use a clip? Desolder better.. Which chip did you do, just 1 or both? I'm looking at a DA0X9MMB8F0 board with a Winbond 25Q128JVSQ 16M chip nearest the "BIOS" legend on the board (primary BIOS?), but also with a GigaDevice 25B127DSIG 16M chip very close
[url]https://pdf1.alldatasheet.com/datasheet-pdf/view/1150074/GIGADEVICE/GD25B127DSIG.html[/url]
[url]https://pdf1.alldatasheet.com/datasheet-pdf/view/1243793/WINBOND/W25Q128JVSIQ.html[/url]
If these are the chips you...Last edited by dualtrace; 01-11-2022, 11:37 AM.Leave a comment:
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HP 850 G3 BIOS dump, view ACPI tables?
I have a 16MB data dump from a desoldered corporate HP Elitebook 850 G3 main BIOS chip, taken using a CH341a programmer. This dump contains a password I have no access to.
I have a fresh BIOS chip, loaded with a clean BIOS for the matching product ID and motherboard number.
I'd like to find and save any SLIC &/or MSDM, ACPI tables contained in the dump from the desoldered chip so that I can if necessary, modify the fresh BIOS chip's contents to preserve the machine's existing Windows 11 installation's licensing/activation etc.
Searching the dump... -
Re: New Members - please post your introductions here
Hi everyone, thanks for granting me access. When some bit of kit won't do what I want it to, I get like a dog with a bone with it until it will. I almost never have the complete set of skills and resources necessary to finish the job all by myself though!Leave a comment:
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