if you met error when upgrade to 3.4 from 3.2.1( kindle 3),see this

[filetemp]

=============
============= if , you change the files in the /etc, please recover it before upgrade,
============= or, you will met strange error.
=============

my kindle 3 is version 3.2.1 when I got it.
I backup all the file by usbnet.
then create and login amazon , it remind me to upgrade to 3.4
then , I download version 3.3 & 3.4
the kindle 3 upgrade must do step by step.
at first , 3.3, I faild.
check and check, the reason found :

============= 1.=============
I have to create the 2 file :
/usr/sbin/mntroot_ro & /usr/sbin/mntroot_rw
and have to chmod 555 /usr/sbin/mntroot_ro /usr/sbin/mntroot_rw
the files' content as following :
**************************
[root@kindle root]# cat /usr/sbin/mntroot_ro
#!/bin/sh
/usr/sbin/mntroot ro
[root@kindle root]# cat /usr/sbin/mntroot_rw
#!/bin/sh
/usr/sbin/mntroot rw


============= 2.=============
I change the file /etc/init.d/wifi
so it's md5 change , and the 3.3 upgrade checksum failed , then all upgrade failed.
I copy the origin , the all looks good , I got the version 3.3

============= 3.=============
then , I copy the version 3.4.bin to my k3, and the upgrade succeed, I got the version 3.4

that's all.