0175: Bad CRC1, Stop POST task ERROR --> SOLVED

[Franchute13]

Hello good.

Trying to fix problem 0175.
Searching in forums I found the following in Spanish:

https://es.linkedin.com/pulse/0175-bad- ... rez-arispe

The post says that by putting some cables in the parallel port it starts up, goes to DOS and applies an update to the BIOS and solves the problem.

Put the cables in the parallel port as follows:
14 - 11
15 - 9
16 - 12
17 - 13
20 - 25

The notebook starts up, it does not give the error 0175 but after a while it shuts down.

What I can be doing wrong?

[Franchute13]

It is very easy to recover a machine with this error.

The following materials are required:
*One male DB25 plug for the parallel port.
*Cable
*A switch or jumper.
switch:
https://4.imimg.com/data4/HJ/QY/MY-3266 ... 50x250.jpg

jumper
https://www.profesionalreview.com/wp-co ... umpers.jpg

*A boot disk with the BIOS of the machine. It can be downloaded from the drivers page.
It does not matter that the battery does not work, the phlash command is used.
More info about the flash.
https://www.thinkwiki.org/wiki/Talk:BIOS_Upgrade

We build the circuit on the db25 connector by joining the pins
14 - 11
15 - 9
16 - 12
17 - 13
20 - 25 -> in the union of these put the switch or jumper.

We connect the dongle in the parallel port.
We short between 20 - 25 and while we do we turn on the notebook.
Release the switch / jumper when we see the screen with the IBM logo

Ready, the machine starts without problems.
Update the bios !!


Easy, fast and cheap !!.
I hope it works.

Tested on an A21m !!

[solidpro]

I had a T20 with the same issue - POST 0175: BAD CRC1, STOP POST TASK ERROR -

I can confirm the instructions below will SOLVE this issue. I took an old Parallel -> Centronics cable which had all 25 pins wired out. I used a continuity tester to find all the pin's wires below, and connected them together.

I then just touched the wires for 20/25 while powering on and basically it skips the CRC check.

I did find the T20 to be very picky about booting if it doesn't have a HDD/decent CR2032 battery to boot from and I used a dock to boot from a floppy but doing this parallel port wiring does indeed force the machine to skip the BIOS EEPROM CRC check so you can get beyond the message. I downloaded the BIOS from the drivers matrix and applied them using a floppy disk and problem solved!

I originally thought this was going to be a weird thing that worked for someone once in a specific scenario and I was wasting my time but actually turned out to be a great little hack which has saved another machine from landfill!

cheers

[Metrus]

Worked on a T20
this forum was a god sent
thanks guys <3

[Macola]

Hello All,

I successfully did the parallel port patch and both bios and ecp flash and my T23 is still giving me bad CRC1 fault when I remove the wires.

That seems quite odd as I was confident that flashing bios will make it go away. Any ideas?

[SMA]

This fix will only work for CRC1 0175 errors.
Start by checking, that what you have, is a CRC1 0175 error and not some other CRC1 error.

[racecar56]

Worked on my A21m, thank you!! I crammed a few paperclips into the parallel port in the specified pins, then used a pair of tweezers for 20>25 which I pulled out when the logo showed. Got a 'resource conflict' error followed by BIOS! With a new CR2032, it appears the computer is happy. Thanks!! Pretty cool that you can confuse it out of that error state by screwing with the parallel port to make it think something's there.

[beshad]

I followed the instructions and shorted the connections on the parallel port, which allowed me to bypass the 0175 error. I then used a bootable disk to start the system and ran the BIOS update, and that fixed the problem. Just to add, the 20–25 connection doesn’t need to be momentary, I kept all the wires connected the whole time and it worked fine. I also had to use flash2.exe from the BIOS disk with the /u flag to bypass the ThinkPad requirement for a fully charged battery.

[DarkSamus9000]

Hello, I'm trying this on a T23, and the paperclips in the parallel port work just as advertised. But my laptop already has the latest version of the BIOS and EC firmware, and so the update packages refuses to do anything.

Does anyone know a way to bypass this check & force the tool to flash the BIOS?

I do also have the equipment to flash externally, but I don't have a known good ROM to flash. If anyone is able to provide me with one, I would be a willing guinea pig.

In the meantime, the paperclips I've gracelessly jammed into the parallel port do bypass the CRC POST error, but I was hoping for a more elegant solution...