Kindle 4 NT for WIFI tethering

Hello,

I want to use my Kindle 4 NT as an USB-WIFI 'stick':
connect the Kindle via USB to my Computer/Raspberry/etc. and to IP-forward the Wifi-Internet-connection of the Kindle to a client.

The problem with the kindle is, that although iptables is there, the ability of ip_forwarding and masquerading is missing due to missing modules.

The KUAL-developer(s) provide these modules in principle:
(http://www.mobileread.com/forums/att...7&d=1361917519), however I can't load the modules on my very device.

I have a jailbreaked device (k4nt) with usbnet running and I tried to insmod the additional kernel modules:
nf_nat.ko and iptables_nat.ko
(in /mnt/us/extensions/system/lib/modules/2.6.31-rt11-lab126/kernel/net/ipv4/netfilter after mounting the cfs-file from KUAL-project)

I get the following error message:

[root@kindle netfilter]# insmod nf_nat.ko
insmod: error inserting 'nf_nat.ko': -1 Unknown symbol in module

ARE THERE ANY DIFFERENT PRECOMPILED MODULE FILES THAT WOULD WORK WITH MY K4NT?

The system output is the following:
/var/log/messages (for insmod nf_nat.ko)

150517:182829 nf_nat: Unknown symbol nf_conntrack_tcp_update
150517:182829 nf_nat: Unknown symbol local_bh_enable
150517:182829 nf_nat: Unknown symbol local_bh_disable

[root@kindle netfilter]# uname -a
Linux kindle 2.6.31-rt11-lab126 #5 Sat Jan 12 20:39:09 PST 2013 armv7l unknown

[root@kindle netfilter]# cat /etc/version.txt
System Software Version: 025-H3_yoshi-181303
Sat Jan 12 20:40:53 PST 2013

[root@kindle netfilter]# cat /etc/prettyversion.txt
Kindle 4.1.1 (~~otaVersion~~)


Thanks in advance, Matz.

(some old threads on this topic did not helped me with this problem:
http://www.mobileread.com/forums/arc.../t-213678.html
http://www.mobileread.com/forums/arc.../t-208766.html)