problem installing kernel modules on ReadyNAS Pro Pioneer

Same here. I got Ultra 2 with latest beta T40. Download T40 kernel-sources with "netgearize" patch. Applied to same version kernel 2.6.37.6. Make with ARCH="x68_64" ...
After that, I get insmod: error inserting './net/ipv4/netfilter/nf_nat.ko': -1 Unknown symbol in module

nas:~/dev/kernel-build-tools-x86/2.6.37/linux-2.6.37.6# uname -a
Linux nas 2.6.37.6.RNx86_64.2.2 #1 SMP Wed Feb 1 12:47:30 PST 2012 x86_64 GNU/Linux

nas:~/dev/kernel-build-tools-x86/2.6.37/linux-2.6.37.6# modinfo /lib/modules/2.6.37.6.RNx86_64.2.2/kernel/drivers/scsi/scsi_wait_scan.ko
filename:       /lib/modules/2.6.37.6.RNx86_64.2.2/kernel/drivers/scsi/scsi_wait_scan.ko
description:    SCSI wait for scans
author:         James Bottomley
license:        GPL
vermagic:       2.6.37.6.RNx86_64.2.2 SMP mod_unload modversions
depends:

nas:~/dev/kernel-build-tools-x86/2.6.37/linux-2.6.37.6# modinfo ./net/ipv4/netfilter/nf_nat.ko
filename:       ./net/ipv4/netfilter/nf_nat.ko
license:        GPL
alias:          nf-nat-ipv4
vermagic:       2.6.37.6.RNx86_64.2.2 SMP mod_unload modversions
depends:        nf_conntrack,nf_conntrack_ipv4

If i try insmod nf_conntrack.ko I get -1 Invalid parameters, and nf_conntrack_ipv4.ko is -1 Unknown symbol in module.
Tried copy them to /lib/modules/2.6.37.6.RNx86_64.2.2/kernel/ but depmod -a gives me No space left on device even if on / where /lib is also is 1012M free. No quotas on /.
Just not enough INodes.

EDIT: Now modules are in /lib/modules/... but modprobe nf_nat:

nas:~/dev/kernel-build-tools-x86/2.6.37/linux-2.6.37.6# modprobe nf_nat
WARNING: Error inserting nf_defrag_ipv4 (/lib/modules/2.6.37.6.RNx86_64.2.2/kernel/net/ipv4/netfilter/nf_defrag_ipv4.ko): Invalid argument
WARNING: Error inserting nf_conntrack (/lib/modules/2.6.37.6.RNx86_64.2.2/kernel/net/netfilter/nf_conntrack.ko): Invalid argument
WARNING: Error inserting nf_conntrack_ipv4 (/lib/modules/2.6.37.6.RNx86_64.2.2/kernel/net/ipv4/netfilter/nf_conntrack_ipv4.ko): Unknown symbol in module, or unknown parameter (see dmesg)
FATAL: Error inserting nf_nat (/lib/modules/2.6.37.6.RNx86_64.2.2/kernel/net/ipv4/netfilter/nf_nat.ko): Unknown symbol in module, or unknown parameter (see dmesg)

And dmegs is full of messages like unknown symbol

...
nf_nat: Unknown symbol __nf_ct_l4proto_find (err 0)
nf_nat: Unknown symbol nf_ct_invert_tuplepr (err 0)
nf_nat: Unknown symbol nf_ct_l3proto_put (err 0)
nf_nat: disagrees about version of symbol skb_put
nf_nat: Unknown symbol skb_put (err -22)
...

EDIT LAST:

After flashing stable 4.2.19 and using GPL package with kernel and config for this version, I compiled it without any change to config. All (4 maybe) modules loaded (by insmod) OK. If just 3-4 NF_NAT needed modules were added, I got

make "ARCH=x86_64" modules
...
Building modules, stage 2.
  MODPOST 9 modules
ERROR: "ip_ct_attach" [net/netfilter/nf_conntrack.ko] undefined!
ERROR: "nf_ct_destroy" [net/netfilter/nf_conntrack.ko] undefined!
ERROR: "nf_conntrack_destroy" [net/netfilter/nf_conntrack.ko] undefined!
ERROR: "nf_conntrack_destroy" [net/ipv4/netfilter/nf_conntrack_ipv4.ko] undefined!

Some other modules can be compiled and loaded though.
So I think whole kernel needs to be recompiled, if you want use NAT on your ReadyNAS device. Kernel is on NAND flash...