gnubee-6.1.1-* are the latest firmware images.

Boot from LVM is now possible.

gnubee-6.1.1-gbpc1.bin is for the (2.5 inch) GnuBee-PC1
gnubee-6.1.1-gbpc2.bin is for the (3.5 inch) GnuBee-PC2
gnubee-6.1.1-gbpc1u.bin is a special firmware image which makes it
  easy to test a new U-boot.

For U-boot hacking, see
   https://github.com/neilbrown/gnubee-tools/commit/def1e207c90606fde3cf9800ef091179903f3e34
and
   https://groups.google.com/d/msg/gnubee/7Z669w7x0PA/3OA4EqB3AwAJ

Please see https://github.com/neilbrown/gnubee-tools/blob/master/README.md
For more information about this firmware, both how to build it yourself
and how to use it.

You can load this onto your gnubee by coping it to a USB drive and giving
it the name "GNUBEE.BIN".  Then plug the USB drive into your gnubee and reboot.
When lights stop flashing, unplug and reboot.

If you have a running Gnubee with mtd-utils installed, you can instead flash
the new firmware with the command

      flashcp -v gnubee-6.1.1-gbpc1.bin /dev/mtd3

You can use the same firmware on 900MHz and 880MHz Gnubees - it detects the correct speed.

You can use the same 4.4 firmeware on the PC1 and the PC2.  It does not support the third
network interface on the PC2.
The 5.x firmware *does* support the third network interface for the PC2, so there
are two separate firmware images.

This firmware expects to find a filesytem called GNUBEE-ROOT, which will be mounted and booted.
If it cannot be found, rescue mode will be entered - assessible through the serial console.

If you hold the black button during boot (until you see a 1:4 blink on one of the LEDs) then
it will enter rescue mode and configure the network and listen for an ssh connection (user:root,
password: GnuBee).
First network port uses IP address 192.168.10.1 and runs a DHCP server.
Second port uses DHCP to get an address.

In rescue mode you can use debootstrap to install a fresh Debian installation.
Try the "config" script - it does much of the work for you.  Some things that it doesn't
do yet are:

 - let you set timezone,

See also the README.md at https://github.com/neilbrown/gnubee-tools/

Report any problems at https://github.com/gnubee-git/GnuBee_Docs/issues
Report successes as well.