Hp CSL50/CSL53 LA-E791P

[m1ch43lzm]

padgurc Please backup the BIOS chip from the new board, and if possible, also backup the BIOS chip from the old board and attach both here

If you have "Manufacture Programming mode is in Unlock mode" message at boot up you can use BCU, otherwise if you set Manufacturing Programming Mode to *Lock you can't change anything in BCU anymore unless you flash a clean BIOS
Best to copy DMI area from dead board to new board, if both boards are the same model (same CPU generation, same board number)

[padgurc]

if possible, also backup the BIOS chip from the old board and attach both here

Thank you, it will probably be a little more difficult to do this with a dead board (I don't have the tools), but I'll try.

[m1ch43lzm]

You need a SPI flash programmer, cheapest option is the CH341A

More info here: https://www.badcaps.net/forum/troubl...21#post1622421

[padgurc]

padgurc Please backup the BIOS chip from the new board, and if possible, also backup the BIOS chip from the old board and attach both here

I finally got the programmer from Ali yesterday. I am adding a link to backup of my new MB and a backup of the dead one. I would appreciate any help you can give me gurus, with instructions on what and how to do.

Dead MB: *******

New MB: *********

Thank you, Dan

[m1ch43lzm]

DMI and Win key added from dead board

HP 250 G6 Notebook PC
S/N CND8115JPR
Win key + DMI 3A9000-3AC3FF

[padgurc]

DMI and Win key added from dead board

HP 250 G6 Notebook PC
S/N CND8115JPR
Win key + DMI 3A9000-3AC3FF

Thank you for sending it. Unfortunately the notebook booted successfully only once and upon the next reboot, it cycled immediately at the beginning. I added a working backup, and it works fine with the SKU number error. The new MB has a different CPU (N4200) whereas it had a "dead MB CPU N3050, see pic. Do you have any other ideas?

[m1ch43lzm]

Both use the same System Board ID 0832E (same BID)
Original board according to S/N: Motherboard (system board) UMA CelN3350 WIN
Replacement is Pentium N4200, same "Apollo Lake" CPU generation

Try again with clean BIOS extracted from HP website, DMI inserted

HP 250 G6 Notebook PC
BIOS Ver. F.77
BID 0832E
S/N CND8115JPR
Win key + DMI 3A9000-3AAFFF
First boot may take few minutes, enter BIOS setup, load setup defaults, on "Boot options" load HP factory default keys, disable Secure Boot, enable Legacy Support (if Windows wasn't installed in UEFI mode)

0832E F77 padgurc.rar
It should still have "Manufacture Programming Mode is in Unlock mode" at startup, use BCU to lock MPM, change the * from *Unlock to *Lock

Manufacturing Programming Mode
    *Lock
    Unlock

Or with the "no DMI" BIOS, you should enter the following:

Product Name: HP 250 G6 Notebook PC
Serial Number: CND8115JPR
SKU Number: 2SX62EA#BED
Build ID: 17WW3U3T601#SBED#DBED
Feature Byte: 3K3Q6b7B7J7M7WaBapaqasawbhbzcbdUdpdqfP.fM
System Board CT Number: PGUMLE61VAFDWE
System Family: HP 200

Make sure you don't have extra characters at the end of each string, such as Tab or something else
UUID you can copy from what you already have (in hex format), or BCU will generate a new one, you should enter like this:

FB8D821234EB11DEB27E00235A9DD9D3

It will translate to {12828DFB-EB34-DE11-B27E-00235A9DD9D3}
0832E F77 no DMI.rar
Don't lock MPM yet, reboot, check if the info is correct, afterwards you can lock MPM

[padgurc]

Both use the same System Board ID 0832E (same BID)
Original board according to S/N: Motherboard (system board) UMA CelN3350 WIN
Replacement is Pentium N4200, same "Apollo Lake" CPU generation

I really don't know what I'm doing wrong, look at the pic please. I'm also adding my BCU config.txt file. Could you please check if all the data is correct, looks all good to me?





Thanks, Dan

[m1ch43lzm]

Manufacturing Programming Mode  
Unlock
   *Lock

MPM is locked in your original BIOS, that's why you can't change anymore, once it's locked you can't change to Unlock until you flash a clean BIOS with external programmer
Did you flash any of the 2 BIOS provided in post # 187?

[padgurc]

Did you flash any of the 2 BIOS provided in post # 187?

I tried both, but I was only able to successfully boot into the WIN environment with "no DMI" BIOS. I later changed it with BCU and it seemed that everything was working as it should. Later I locked MPM as well. After changing some parameters in the BIOS it apparently "broke" again and I can't even enter the BIOS settings. I have to repeat the process again and test the operation thoroughly.

[padgurc]

After changing some parameters in the BIOS it apparently "broke" again and I can't even enter the BIOS settings. I have to repeat the process again and test the operation thoroughly.

I repeated the entire procedure but without success. "0832E F77 padgurc.bin" was in a reboot state and I couldn't even get into BIOS Setup any more. With "0832E F77 no DMI.bin" I successfully changed the following with BCU: Product Name, Serial Number, SKU Number, Build ID, Feature Byte, System Board CT Number, System Family. Rebooted and everything looks fine in BIOS. After the first start of Win with BCU, I also performed "MPM Lock". Rebooting again causes cycling and I cannot access nor bios nor the Win. I try also with "Win key + B + Power ON" for BIOS Update and the system no longer boots at all. Tomorrow I will try to add my backup again.

[m1ch43lzm]

Do you get HP logo when it reboots?
Try removing battery and HDD/SSD, check if you can enter BIOS setup

EDIT: BIOS chip is 1.8V for your board LA-E821P, make sure your programmer supports 1.8V chips, or use 1.8V adapter