bios for hp PROBOOK 455 G9

[rex98]

I noticed there's a lot of unlock request for this model HP ProBook 455 G9
The patch won't work if the bios version is latest. use this bin flash both it won't work if you only flash the main you should Flash Both.
first boot press f10 apply factory defaults and restart, 2nd boot reset security settings to defaults and exit.
use BCU and put your original DMI.
frequently asked questions:
can i use this to my HP ProBook 455 G9- yes

This is the both BID U78 and U88 its all you need.
This bios main is from official website then added VSSTORE and patched so its fast-boot just like intel clearme.
to determine your BID use hex editor and search U88 or U78 in your main bios bin, you know the rest.

[moshu]

I noticed there's a lot of unlock request for this model HP ProBook 455 G9
The patch won't work if the bios version is latest. use this bin flash both it won't work if you only flash the main you should Flash Both.
first boot press f10 apply factory defaults and restart, 2nd boot reset security settings to defaults and exit.
use BCU and put your original DMI.
frequently asked questions:
can i use this to my HP ProBook 455 G9- yes

This is the both BID U78 and U88 its all you need.
This bios main is from official website then added VSSTORE and patched so its fast-boot just like intel clearme.
to determine your BID use hex editor and search U88 or U78 in your main bios bin, you know the rest.

Thanks rex98. I confirm it is working fine.
Took me almost half a day to to write the chips because is not easy to me to unsolder them from MB and put them back without damaging plastic around them.
What would be the bios version that will require patching only main chip?
also to put original DMI I was using BCU but I was not sure if I could use the original one to write the settings or only some settings? What do you recommend?

[rex98]

Thanks rex98. I confirm it is working fine.
Took me almost half a day to to write the chips because is not easy to me to unsolder them from MB and put them back without damaging plastic around them.
What would be the bios version that will require patching only main chip?
also to put original DMI I was using BCU but I was not sure if I could use the original one to write the settings or only some settings? What do you recommend?

your's is U78

and this is your DMI

Serial Number: 5CD2315F08
Product #/SKU: 4S0R3AV
CT Number: PPQNF048JGY00W
Description: HP ProBook 455 15.6 inch G9
BuildID: 22WWTPBT602#SABU#DABU
Feature Byte: 476J6S6b7B7J7M7Q7W7saBapaqauawbhcAdpdqfPguk8mEn7nWpFpqqjqz.qf
MAC Address : 5C:60:BA:B8:62:3C

[moshu]

your's is U78

and this is your DMI

Serial Number: 5CD2315F08
Product #/SKU: 4S0R3AV
CT Number: PPQNF048JGY00W
Description: HP ProBook 455 15.6 inch G9
BuildID: 22WWTPBT602#SABU#DABU
Feature Byte: 476J6S6b7B7J7M7Q7W7saBapaqauawbhcAdpdqfPguk8mEn7nWpFpqqjqz.qf
MAC Address : 5C:60:BA:B8:62:3C

thanks, I have those information as well, except MAC address.

If the bios version is not new (08/11/2022), can I only patch the main chip?

[rex98]

thanks, I have those information as well, except MAC address.

If the bios version is not new (08/11/2022), can I only patch the main chip?

just follow my instructions flash both. if you want latest bios just update

[volinakis]

Thanks rex98. I confirm it is working fine.
Took me almost half a day to to write the chips because is not easy to me to unsolder them from MB and put them back without damaging plastic around them.
What would be the bios version that will require patching only main chip?
also to put original DMI I was using BCU but I was not sure if I could use the original one to write the settings or only some settings? What do you recommend?

use Kapton tape for plastic parts around bios chipsets. Since March 2024 HP changed security and models with bios newer than March 2024 can't be patched to enter mpm. Rex98 files are very good to unlock HPs, update bios in steps - use a version from 2023, then other from 2024 and so on. Personally I use files where they updated ME versions, I had a update failure when I tried to update directly to last version. MAC Adress is on a label on motherboard, as well as CT.

[moshu]

just follow my instructions flash both. if you want latest bios just update

I've flash the main chip, hopping I will not have to flash the SPI chip (is not easy for me to attach wires or removed from motherboard) and now laptop doesn't boot. There were several attempts to start (looking on the power LED) but nothing on the screen.
Then I've flash both chips but still nothing is happening.

When I plug in the power cable, CapsLock LED and power LED (key) does light 4 seconds, then power LED (key) turn off and NumKey LED + LED from charging port, light for ~2 seconds then nothing else is happening.

With or without DDR same behavior.

Any way I can make it boot again?

[volinakis]

I've flash the main chip, hopping I will not have to flash the SPI chip (is not easy for me to attach wires or removed from motherboard) and now laptop doesn't boot. There were several attempts to start (looking on the power LED) but nothing on the screen.
Then I've flash both chips but still nothing is happening.

When I plug in the power cable, CapsLock LED and power LED (key) does light 4 seconds, then power LED (key) turn off and NumKey LED + LED from charging port, light for ~2 seconds then nothing else is happening.

With or without DDR same behavior.

Any way I can make it boot again?

dude, flash BOTH chipsets as rex98 said, don't try to reinvent warm water!

[moshu]

dude, flash BOTH chipsets as rex98 said, don't try to reinvent warm water!

Eventually I did and Laptop doesnt boot

[volinakis]

Eventually I did and Laptop doesnt boot

yep, you wrote 1st main then power up laptop, didn't work so you wrote EC without writing again main, right? You tried to reinvent the wheel this time...
Rex explained to you that you have to write BOTH IN SAME TIME, then power up laptop. You are the kind that you find a problem for every solution ...

[SMDFlea]

Eventually I did and Laptop doesnt boot

What programmer are you using, did you erase the chips before programming

[moshu]

What programmer are you using, did you erase the chips before programming

I've used T48 (I am looking to buy a Vertyanov Successor Programmer or a svod4 programmer but dont know which one to pick and where to buy from ; I will appreciate if you can help here too).
With T48 before programming, there is an erase step which took ~100seconds.
On this laptop, I've programed the main chip without removing the chip from motherboard and connected the CMOS battery otherwise an error in the verify stage would appear.

One think I will try is to remove the main chip on the motherboard and try try again.

First laptop I program both chips (main removed from motherboard and the SPI programmed using wires on motherboard; I am not so skilled with hot-gun as of now) and did worked eventually.

If there is a way to fix the current issue on this laptop which is not booting, please let me know

Thanks

[One stop shop]

Please can someone help me out with the images of the two bios chips and the surrounding resistors.I was trying to desolder the bios chip and accidentally knocked one or two components off and I'm trying to identify them.It doesn't post anymore,just 7 blinks.Any help will be appreciated,thanks

[moshu]

Please can someone help me out with the images of the two bios chips and the surrounding resistors.I was trying to desolder the bios chip and accidentally knocked one or two components off and I'm trying to identify them.It doesn't post anymore,just 7 blinks.Any help will be appreciated,thanks

here are some pictures.
Good Luck

[One stop shop]

here are some pictures.
Good Luck

Thanks alot, I see a resistor in the wrong position,I'll fix that and post an update

[moshu]

Is there any way to program the EC without pulling out from motherboard?
I am able to read it using T48 but I am not able to erase it properly.
SVOD4 is not able to recognize it show " status register 1 0XFF " & "status register 2 0XFF "
CH 341 is not able to provide enough current so does disconnect the programmer once I connect the wires.

[karemkf]

hi ineed unloke file
sn-2tk22507rr
mb da0x9smb8d1 rev

[SMDFlea]

hi ineed unloke file
sn-2tk22507rr
mb da0x9smb8d1 rev

Off topic, this thread is for the 455 G9. Your serial number is for the 645 14 inch G9