Dear Christos,

here you have the link for downloading the BIOS and EC:

https://cloud.slimbook.net/s/download/download?path=%2FLaptops%2FExcalibur%2FAMD%2FRyzen-7840HS Silver%2FBIOS&files=Excalibur_AMD7000HS_BIOS_SLIMH6.05_EC_1.04.zip

here you have a tutorial on how to perform the update for the BIOS and EC:

https://slimbook.com/en/blog/guides-2/post/how-to-update-bios-and-ec-on-your-slimbook-377

If you want to open the laptop just make sure you have a PH0 screwdriver like this one:

https://slimbook.com/en/shop/product/05118022001-screwdriver-phillips-ph-0-x-60-mm-2050-ph-1479#attr=

Just remove all the screws and use a thin plastic piece to separate the lid from the body chasis.

If you have any issues please advise.

unable to boot from usb gpt flash stick, laptop simply no see it. It is possible a premade iso to download and i go use rufus ?

My bios version is 2024 date but is buggy, i need to install the lastest one 2025, if nothing happens, it seem the laptop no support win 11 correctly

Yes, Rufus lets you install Windows 11 without meeting the requirements :D

My issue in the instrutions of support website, there no telling clearly how to make a bootable disk or how exactly the computer will see the usb device to procced with the updated bios install..

This computer don't recognize usb stick with bios bootable.

I need a iso gpt(UEFI) with this bios, to put into a usb stick.

Laptop can see others bootable USB sticks like Kali Linux. 

Because in there no exist in support website iso with bios bootable for USB disk 

Dear Bratsos,

please confirm us that the USB stick is in FAT32 format,

the usb has to be completely clear with no other files,

then extract the zip file, copy the unzipped contents to the usb and try to boot.

The contents already have efi files that make it bootable from UEFI, we have performed this task many times with these files.

Once you boot into the usb, enter in the command line:

cd FS1:

then

cd BIOS

then 

F. nsh

Please advise if you have any doubts.