The default network configuration is:

The GoFlexNet cannot be put into failsafe mode by pressing the button.

It can however be put in failsafe mode using serial console and pressing 'f' and <enter> when prompted during boot-up

The GoFlexNet's only button is not configurable and inevitably performs a hard reset when pressed, the button open the bridge between the positive pole and the power cord.

See Crypto Hardware Acceleration

for serial cable (nokia's DKU-5, CA-42 and etc ttl…), 115200 8n1:

NOTE: The pins to use are the ones "covered up" by the tips of the arrows, i.e. the pins in the row toward the outer edge of the PCB. (for comparison, see here)

for enable 3.5" disks (3 pins sata power to +12V DC):

NOTE: The ellipse in the picture indicates three pins for Serial ATA +12 V. (Multiple pins are used for current (Ampere) considerations, compare https://en.wikipedia.org/wiki/Serial_ATA#Power_connectors.)

example:

There are no screws - the bottom cover is held by ten plastic snap on clips, three on the sides and two on the edges. To open the case, gently pry all around with a thin screwdriver until it is open.

The serial pins are accessible without further disassembly.

Connect device to Ethernet port. To prevent automatic updates by cloud engines (which may disable ssh access), use a separate switch or disconnect your router from the internet. If the ssh access was disabled by the automatic cloud engine update service, you need to login there and re-activate ssh.

Find IP address, BE and EF are the last two bytes of the MAC of your device (printed on the bottom of the GoFlexNet)

root@host ~ # ifconfig eth0 169.254.1.0 
root@host ~ # nmap -e eth0 -sP $(printf "169.254.%d.%d" 0xbe 0xef)

Connect to IP address via ssh (root / stxadmin) to see if it works.

Login to the original firmware via SSH (enable it first in popoplug site) or Serial cable (nokia's CA-52, DKU-5 and etc ttl…). Plug the flash drive (FAT32) to USB port in Seagate GoFlex Net, then:

mkdir /tmp/backup
mount /dev/sda1 /tmp/backup
cd /tmp/backup
wget http://download.doozan.com/uboot/nanddump
chmod +x nanddump
./nanddump -nof uboot-mtd0-dump /dev/mtd0
./nanddump -nof uboot-original -s 0 -l 0x80000 /dev/mtd0
./nanddump -nof uImage-mtd1-dump /dev/mtd1
./nanddump -nof rootfs-mtd2-dump /dev/mtd2
umount /dev/sda1

#set goflex net ip
setenv ipaddr '192.168.1.1'
#set tftp-server ip
setenv serverip '192.168.1.2'

#original uImage (backuped before)
tftpboot 0x800000 uImage-mtd1-dump
nand erase 0x100000 0x400000
nand write.e 0x800000 0x100000 0x400000

#original rootfs (backuped before)
tftpboot 0x800000 rootfs-mtd2-dump
nand erase 0x500000 0x2000000
nand write.e 0x800000 0x500000 0x2000000

resetenv

setenv bootcmd 'nand read.e 0x800000 0x100000 0x300000; setenv bootargs $(console) $(bootargs_root); bootm 0x800000'

#change value to your device
setenv ethaddr '00:10:75:26:3D:9F'
setenv cesvcid '5RFAJDGYNLPLDUHN4BWUWC3EKJ'
setenv ceserialno 'NA1Y0EG1'
setenv ceboardver 'DISCOVERY:0.1'
saveenv

reset

download via tftp and run-test

#set goflex net ip
setenv ipaddr '192.168.1.1'
#set tftp-server ip
setenv serverip '192.168.1.2'
tftp 0x800000 uboot.mtd0.kwb
go 0x800200

Write new uBoot

# Erase the first 512k of /dev/mtd0
flash_erase /dev/mtd0 0 4
# Write the new bootloader
nandwrite /dev/mtd0 uboot.mtd0.kwb
# Cross your fingers and reboot..

#set goflex net ip
setenv ipaddr '192.168.1.1'
#set tftp-server ip
setenv serverip '192.168.1.2'
setenv arcNumber '3089'
setenv mainlineLinux 'yes'
setenv bootcmd 'nand read.e 0x6400000 0x100000 0x400000; bootm 0x6400000;'
setenv bootargs 'console=ttyS0,115200 root=/dev/mtdblock2 rw rootfstype=jffs2'
saveenv
mw 0x6400000 0xffff 0x400000
#flash kernel: http://downloads.openwrt.org/snapshots/trunk/kirkwood/openwrt-kirkwood-uImage
tftpboot 0x6400000 openwrt-kirkwood-uImage
nand erase 0x100000 0x400000
nand write.e 0x6400000 0x100000 0x400000
#flash rootfs: http://downloads.openwrt.org/snapshots/trunk/kirkwood/openwrt-kirkwood--jffs2-128k.img
mw 0x6400000 0xffff 0x400000
tftpboot 0x6400000 openwrt-kirkwood--jffs2-128k.img
nand erase 0x500000 0xfb00000
nand write.e 0x6400000 0x500000 0x400000
reset

to enable SSH access for this Pogoplug device - register in https://goflexnet.pogoplug.com then, in settings - Activate a Pogoplug device, after that, in settings - Enable SSH access for this Pogoplug device and enter new password for root.

in ssh:

/usr/local/cloudengines/bin/blparam arcNumber='3089'
/usr/local/cloudengines/bin/blparam mainlineLinux='yes'
/usr/local/cloudengines/bin/blparam bootcmd='nand read.e 0x6400000 0x100000 0x400000; bootm 0x6400000;'
/usr/local/cloudengines/bin/blparam bootargs='console=ttyS0,115200 root=/dev/mtdblock2 rw rootfstype=jffs2'
killall -9 hbwd
killall -9 hbplug
cd /tmp
wget http://downloads.openwrt.org/snapshots/trunk/kirkwood/openwrt-kirkwood-uImage
wget http://downloads.openwrt.org/snapshots/trunk/kirkwood/openwrt-kirkwood--jffs2-128k.img
flash_eraseall /dev/mtd1
nandwrite -p /dev/mtd1 openwrt-kirkwood-uImage
flash_eraseall /dev/mtd2
nandwrite -p /dev/mtd2 openwrt-kirkwood--jffs2-128k.img
flash_eraseall /dev/mtd3
#unplug power