Hello,

I tried to Dump my Dell XPS 9550 with the CH341A V 1.31 and selected an Size of 16MB but it looks like, that the Size of the Chip is 32MB. I have extracted the Original BIOS and all File has an Size of 25MB. Is it possible to dump an BIOS Chip lager than 16 MB with this tool?
I also have read that there is the Intel Boot Guard active which prevents that another BIOS can't be booted when it is directly written to the BIOS Chip. I also tried to open the BIOS with the Intel Flash Image Tool but I get this error message:
Error 10: Failed to open with processed commands.
Unable to open file: xps_new.bin. Reverting to default configuration.

When I open this File with the UEFI Tool then I have no error and also not with the UBU Tool.

This is the Output of MEInfo which I have made:

You have the flash descriptors locked, that's why you will not be able to dump your bios with FPT.

The only thing you can do is to dump it via CH341A using 1.18 version (which is the best one).

Anyway, according to FTP your eeprom (Winbond) is a 128 Mbit chip (16 MByte), so how can you be sure
that it's a 32 MB size eeprom ?

You indeed have 16 Mb SPI flash and dump file, updates are not using the same format.
You also indeed have BootGuard enabled and enforced, so almost any changes in FW will result in a brick.
You can store that dumped image as backup copy in case of brick (to restore with the same SPI programmer later), but there's not much to do here otherwise.

Hey guys,

Coming to you with a question regarding a 9550 I managed to brick. I virtually ran out of ideas
After successfully running the laptop with Corma's me_cleaner I did the mistake of trying to update the BIOS trough the .EXE file from the dell website and it obviously bricked my device.
I'm suspecting that the .exe is writing some parts of bios on all 3 of the bios chips (16M, 4MB, 1MB), correct me if i'm wrong on this.

I've tried to use different dumps, however i don't believe they match as with different combinations I get different activity either just a very brief blink of the power LED (blank screen) or the most I got was blank screen and gives a CPU Fail code (1 white 2 Amber) error code.

Any ideas if having all 3 dumps from a different laptop would be a solution for this, maybe I would be able to pull together all 3
Would anyone have handy a dump of these 3 chips? [MB is : LA-C361P Rev2.0 (A01)]

Thanks a lot,

Yes, reprogramming all three with some other systems dumps would get the board back up and running, but you'd need to put in your asset tag and LAN ID first (Or later) Do you have hardware flash programmer and SOIC8 test clip cable?

I will try to find you dumps tonight. Hopefully you have a dump of the main BIOS at least before you started all this modding.

*Edit - @lorantisz - One is BIOS (FD, ME, GbE, BIOS) (16MB), one is Intel ME copy maybe (4MB) see below, and one is EC probably (1MB) - I assume the BIOS and ME would probably be the only ones you need to correct, maybe only ME chip
Dump all three and upload here and lets have a look, or upload all three's backups you made before doing anything further to them once the issue happened

I was only able to find a "Clear_ME" dump from DIAGRAMAS.COM.BR, no one needs to be doing this silly clear/clean ME stuff.... It's like an old wives tale gone rouge now

*Edit, found a site giving all four dumps? - https://www.laboneinside.com/dell-xps-15-9550-bios-bin/
I checked these files and it's only two actual dumps, one 4MB and one 16MB. 4MB looks to be EC like, I see Thunderbolt and display stuff mentioned, it's not ME. Data in this is only 187KB, rest is 00-Fill, which looks about correct for an EC FW
This should get you going again, don't edit the files until after you've tested and see if they work as is or not.

This system has bootguard enabled, and it's burned into the chipset/FPF, no BIOS modifications at all can be done inside the yellow areas of the BIOS when viewing BIOS in UEFITool NE Alpha.
Possibly no edits at all can be made, but only more testing would be able to verify that, since you had ME edit working OK then possibly it may be only those two areas within the BIOS region can't be edited..
You need to program back to 100% stock for now, then once running again you can try to play more... or not.

See also, this comment and link on recovery method at second to last post on page one, recovery wouldn't work for him until he removed his hard drive
https://www.dell.com/community/XPS/Bios-...50/td-p/6054857

And see here, did you flash wrong firmware?
https://www.dell.com/community/XPS/Pleas...re/td-p/5653624

And, see end of this, maybe this way you can try to recover too if you have not already
https://github.com/wmchris/DellXPS15-955...bios_upgrade.md

I will try This on my Board!

Zitat von Lost_N_BIOS im Beitrag #5

---

I was only able to find a "Clear_ME" dump from DIAGRAMAS.COM.BR, no one needs to be doing this silly clear/clean ME stuff.... It's like an old wives tale gone rouge now

---