I've upgraded an Atcom IP2G4A, and after upgrade, it doesn't boot. If I connect via serial RS232 interface, I got the following

Booting kernel from Legacy Image at 02000000 ...
Image Name: uClinux Kernel and ext2
Image Type: Blackfin Linux Kernel Image (gzip compressed)
Data Size: 7122892 Bytes = 6.8 MiB
Load Address: 00001000
Entry Point: 00200000
Verifying Checksum ... OK
Uncompressing Kernel Image ... OK
Starting Kernel at = 00200000
Linux version 2.6.22.18-ADI-2008R1astfin-svn (wang@ubuntu) (gcc version 4.1.2 (A
DI svn)) #18 Tue Jun 19 09:25:26 CST 2012
Hardware Trace Active and Enabled
Blackfin support © 2004-2007 Analog Devices, Inc.
Compiled for ADSP-BF533 Rev 0.5
Warning: Compiled for Rev 5, but running on Rev 6
Blackfin Linux support by http://blackfin.uclinux.org/
Processor Speed: 400 MHz core clock and 133 MHz System Clock
Board Memory: 64MB
Kernel Managed Memory: 64MB
Memory map:
text = 0x00001000-0x0017cc30
rodata = 0x0017d000-0x001e4bc4
data = 0x001e5000-0x00200000
stack = 0x001e6000-0x001e8000
init = 0x00200000-0x00217000
bss = 0x00217000-0x0022d2d4
available = 0x0022d2d4-0x02f00000
rootfs = 0x02f00000-0x03f00000
DMA Zone = 0x03f00000-0x04000000
Instruction Cache Enabled
Data Cache Enabled (write-back)
Built 1 zonelists. Total pages: 11938
Kernel command line: ethaddr=00:09:45:5C:2F:1A ethaddr1=00:09:45:5C:2F:1B consol
e=ttyBF0,115200 earlyprink=serial,uart0,115200 root=/dev/mtdblock0 rw mtdparts=i
p0x-nand:0x00800000(kernel),0x0f800000(fs)
Configuring Blackfin Priority Driven Interrupts
PID hash table entries: 256 (order: 8, 1024 bytes)
Console: colour dummy device 80x25
Dentry cache hash table entries: 8192 (order: 3, 32768 bytes)
Inode-cache hash table entries: 4096 (order: 2, 16384 bytes)
Memory available: 45316k/65536k RAM, (92k init code, 1519k kernel code, 613k dat
a, 1024k dma, 588k reserved)
Blackfin Scratchpad data SRAM: 4 KB
Blackfin Data A SRAM: 16 KB (16 KB free)
Blackfin Data B SRAM: 16 KB (16 KB free)
Blackfin Instruction SRAM: 64 KB (55 KB free)
Security Framework v1.0.0 initialized
Mount-cache hash table entries: 512
NET: Registered protocol family 16
Blackfin GPIO Controller
Blackfin DMA Controller
ip0x_init(): chip_id=627A50CB,dspid=E5040006
ip0x_init(): registering device resources
SCSI subsystem initialized
usbcore: registered new interface driver usbfs
usbcore: registered new interface driver hub
usbcore: registered new device driver usb
NET: Registered protocol family 2
IP route cache hash table entries: 1024 (order: 0, 4096 bytes)
TCP established hash table entries: 2048 (order: 2, 16384 bytes)
TCP bind hash table entries: 2048 (order: 1, 8192 bytes)
TCP: Hash tables configured (established 2048 bind 2048)
TCP reno registered
yaffs Jun 18 2012 13:57:54 Installing.
io scheduler noop registered
io scheduler anticipatory registered (default)
io scheduler cfq registered
bfin-wdt: initialized: timeout=20 sec (nowayout=0)
Serial: Blackfin serial driver
bfin-uart.1: ttyBF0 at MMIO 0xffc00400 (irq = 21) is a BFIN-UART
RAMDISK driver initialized: 16 RAM disks of 4096K size 1024 blocksize
PPP generic driver version 2.4.2
PPP Deflate Compression module registered
PPP BSD Compression module registered
PPP MPPE Compression module registered
NET: Registered protocol family 24
SLIP: version 0.8.4-NET3.019-NEWTTY (dynamic channels, max=256).
CSLIP: code copyright 1989 Regents of the University of California.
tun: Universal TUN/TAP device driver, 1.6
tun: © 1999-2004 Max Krasnyansky <maxk@qualcomm.com>
uclinux[mtd]: RAM probe address=0x2f00000 size=0x1000000
Creating 1 MTD partitions on "RAM":
0x00000000-0x01000000 : "ROMfs"
Generic platform RAM MTD, © 2004 Simtec Electronics
Kernel command line: ethaddr=00:09:45:5C:2F:1A ethaddr1=00:09:45:5C:2F:1B consol
e=ttyBF0,115200 earlyprink=serial,uart0,115200 root=/dev/mtdblock0 rw mtdparts=i
p0x-nand:0x00800000(kernel),0x0f800000(fs)
pcmdline: mtdparts=ip0x-nand:0x00800000(kernel),0x0f800000(fs)
NAND device: Manufacturer ID: 0xec, Chip ID: 0xda (Samsung NAND 256MiB 3,3V 8-bi
t)
Scanning device for bad blocks
Bad eraseblock 193 at 0x01820000
Bad eraseblock 988 at 0x07b80000
cmdlinepart partition parsing not available
ip0x_nand: No parititions defined, or unsupported device.
driver isp1362-hcd, 2005-04-04
isp1362-hcd isp1362-hcd.0: ISP1362 Host Controller
isp1362-hcd isp1362-hcd.0: new USB bus registered, assigned bus number 1
isp1362_hc_reset:
Clock not ready after 100ms
isp1362-hcd isp1362-hcd.0: can't setup
isp1362-hcd isp1362-hcd.0: USB bus 1 deregistered
init error, -19
Initializing USB Mass Storage driver...
usbcore: registered new interface driver usb-storage
USB Mass Storage support registered.
nf_conntrack version 0.5.0 (376 buckets, 3008 max)
ip_tables: © 2000-2006 Netfilter Core Team
TCP cubic registered
NET: Registered protocol family 1
NET: Registered protocol family 17
802.1Q VLAN Support v1.8 Ben Greear <greearb@candelatech.com>
All bugs added by David S. Miller <davem@redhat.com>
drivers/rtc/hctosys.c: unable to open rtc device (rtc0)
VFS: Mounted root (ext2 filesystem).
Freeing unused kernel memory: 92k freed
dma_alloc_init: dma_page @ 0x00212000 – 256 pages at 0x03f00000
devpts: called with bogus options
mount: mounting /dev/mtdblock2 on /persistent failed
Checking for upload image to program
modprobe: module restore not found
modprobe: failed to load module restore
Can not find persistent configuration files
We are going to unpack default configuration!!!
persistent/
persistent/tftpboot/
persistent/sounds/
persistent/sounds/otherwise.gsm
persistent/sounds/if-u-know-ext-dial.gsm
persistent/sounds/to-reach-operator.gsm
persistent/sounds/pls-hold-while-try.gsm
persistent/sounds/thank-you-for-calling.gsm
persistent/usr/
persistent/usr/share/
persistent/usr/share/zoneinfo/
persistent/usr/share/zoneinfo/AFT-4:30
persistent/usr/share/zoneinfo/GMT-3
persistent/usr/share/zoneinfo/GMT-2
persistent/usr/share/zoneinfo/CET-1CEST
persistent/usr/share/zoneinfo/PKT-5
persistent/usr/share/zoneinfo/EET-2EEST
persistent/usr/share/zoneinfo/SST11
persistent/usr/share/zoneinfo/IST-5:30
persistent/usr/share/zoneinfo/MAGT-11MAGST
persistent/usr/share/zoneinfo/AST4ADT
persistent/usr/share/zoneinfo/BDT-6
persistent/usr/share/zoneinfo/AZOT1AZOST
persistent/usr/share/zoneinfo/NRT-12
persistent/usr/share/zoneinfo/HST10
persistent/usr/share/zoneinfo/CST-9:30CST
persistent/usr/share/zoneinfo/GMT0BST
persistent/usr/share/zoneinfo/NZST-12NZDT
persistent/usr/share/zoneinfo/MST7MDT
persistent/usr/share/zoneinfo/EST5EDT
persistent/usr/share/zoneinfo/ICT-7
persistent/usr/share/zoneinfo/IRDT
persistent/usr/share/zoneinfo/WST-8
persistent/usr/share/zoneinfo/NST3:30NDT
persistent/usr/share/zoneinfo/ChST-10
persistent/usr/share/zoneinfo/AST-3
persistent/usr/share/zoneinfo/JST-9
persistent/usr/share/zoneinfo/GST-4
persistent/usr/share/zoneinfo/PST8PDT
persistent/usr/share/zoneinfo/CST6CDT
persistent/var/
persistent/var/log/
persistent/var/log/asterisk/
persistent/var/log/asterisk/cdr-csv/
persistent/var/lib/
persistent/var/lib/asterisk/
persistent/var/lib/asterisk/agi-bin/
persistent/var/lib/asterisk/agi-bin/ip.sh
persistent/var/lib/asterisk/agi-bin/record.sh
persistent/var/lib/asterisk/gui_backups/
persistent/var/lib/asterisk/firmware/
persistent/var/lib/asterisk/firmware/iax/
persistent/etc/
persistent/etc/hosts
persistent/etc/udhcpd.conf
persistent/etc/HOSTNAME
persistent/etc/archive.sh
persistent/etc/rcparse.sh
persistent/etc/rc.d/
persistent/etc/rc.d/S10network
persistent/etc/rc.d/S30ntp
persistent/etc/rc.d/S35cron
persistent/etc/rc.d/S40zaptel
persistent/etc/rc.d/S99local
persistent/etc/rc.d/S50asterisk
persistent/etc/vlan.sh
persistent/etc/init.d/
persistent/etc/init.d/network
persistent/etc/init.d/vlan
persistent/etc/init.d/cron
persistent/etc/init.d/zaptel
persistent/etc/init.d/asterisk
persistent/etc/init.d/dhcpd
persistent/etc/init.d/ntp
persistent/etc/ssmtp/
persistent/etc/ssmtp/revaliases
persistent/etc/ssmtp/ssmtp.conf
persistent/etc/passwd
persistent/etc/cleanps.sh
persistent/etc/checkgateway.sh
persistent/etc/killprocess.sh
persistent/etc/IsAsteriskAlive.sh
persistent/etc/fw_env.config
persistent/etc/ppp/
persistent/etc/ppp/ip-down
tar: cannot create directory 'persistent/etc/ppp': No space left on device
tar: persistent/etc/ppp/ip-down: No such file or directory
Checking if the reset button is pressed
mmc_pio_spi:cs_#: 0x5, baud=0x3, flag=0xff00, ctrl=0x0
mount: mounting /dev/mmc on /mnt/sd failed
no sd/mmc card found
/etc/asterisk/asterisk.conf: cannot create
/etc/asterisk/asterisk.conf: cannot create
/persistent/etc/network.sh: cannot open
/persistent/etc/network.conf: cannot open
chown: /persistent/etc/config/crontab: No such file or directory
/persistent/etc/opermode: cannot open
cat: /etc/TZ: No such file or directory
ping: downloads.digium.com: Unknown host
BusyBox v1.4.1 (2012-06-18 14:08:56 CST) Built-in shell (msh)
Enter 'help' for a list of built-in commands.

It seems it's running out of space but I can't find which files have I to delete. I have access to the root> command via RS232. Can somebody help me?
Thanks and regards,
Joan