Fujitsu P910 E85+ BIOS update & diagnostics

This document explains how to create an USB 64MB bootable stick based on FreeDOS that can provide BIOS update, diagnostic and flasher tools. It is specifically tailored for Esprimo P910 E85+ but it can be used as a canvas for every other PC/laptop for which DOS tools are available.

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1. FreeDOS bootable USB image

Source: download page

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2. Last stable LiteUSB

Source: FreeDOS 1.3 Lite USB

   - wget : $archive    - unzip : $archive    - dd : $image : $usbdisk    - gparted : $usbdisk : resize : 63MiB    - mount : $usbdisk1 : $usb1dir

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3. Fujitsu support

Source: Quick search  –  keyword: D3162-A1x

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4. Latest diagnostic tools available

Source: FTS System Diagnostics DOS USB Stick

   - download : $archive    - unzip : $archive : ./diag/

dst <= [usb1 mount-point path]

cp -arf ./diag/*/data/* ${dst}/
sed -e '/\.sys/ s,FREEDOS\\BIN,\FDOS,I' -i ${dst}/CONFIG.SYS
sed -e 's,=[^ ]*\(\\COMMAND.COM\),=\1,gI' -i ${dst}/fdconfig.sys
sed -e 's,\(SET DOSDIR=\).*,\1\\FDOS,I' -e 's,\(%dosdir%\)\\bin,\1,gI' -i ${dst}/fdauto.bat
sed -e "s/%[bram]\{0,3\}DRV%://gI" -e "s,%1:[%\\],,g" -i $(find ${dst} -iname \*.bat)
sed -e "s/bat %DRV%/bat ''/" -i ${dst}/TOOLS/BASE/me.bat
mv ${dst}/AUTOEXEC.BAT ${dst}/diag.bat

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5. Latest BIOS available admin package

Source: FTS D3162A1x Admin package

   - download : $archive    - unzip : $archive : ./bios/

dst <= [usb1 mount-point path]

cp -arf ./bios/DOS/* ${dst}/
umount ${dst}/

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6. Customised bootable image backup (optional)

usbdisk <= [usb disk device]

umount ${usbdisk}*
fdisk -l ${usbdisk} | grep ${usbdisk}1

sectors <= [usb disk p1 size in 512 byte sectors, biggest number]

image="fdos-p910-bios-diag.img"
dd if=${usbdisk} count=${sectors} | pigz - >${image}.gz

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7. Post archiving image modding (optional, not required)

image="fdos-p910-bios-diag.img"
pigz -dc ${image}.gz > ${image}; losetup -Pf ${image}

[do whatever you like on loop device 1st partition]

losetup -D $(losetup -l | grep ${image} | cut -d' ' -f1)

8. Usage

   WARNING!  

It strongly suggested a cold reboot between HW diagnosys and BIOS update.

   - keyb it - for the italian keyboard

   - diag.bat - for hardware diagnosys

   - dosflash.bat - for the bios update

Copyright

© 2025, Roberto A. Foglietta <roberto.foglietta@gmail.com>, CC BY-NC-ND 4.0