OK Mojo, I did what you said, here is the outcome:
root@slitazCPX:/home/user# /etc/init.d/network.sh start
ifconfig: SIOCGIFFLAGS: No such device
ifconfig: SIOCGIFFLAGS: No such device
Configuring wlan0... [ OK ]
Starting wpa_supplicant for WPA-PSK...
Starting udhcpc client on: wlan0...
Selected interface 'wlan0'
root@slitazCPX:/home/user# ping mirror.slitaz.org
PING mirror.slitaz.org (94.23.209.91): 56 data bytes
64 bytes from 94.23.209.91: seq=0 ttl=48 time=116.388 ms
64 bytes from 94.23.209.91: seq=1 ttl=48 time=112.723 ms
64 bytes from 94.23.209.91: seq=2 ttl=48 time=114.980 ms
64 bytes from 94.23.209.91: seq=3 ttl=48 time=113.030 ms
64 bytes from 94.23.209.91: seq=4 ttl=48 time=113.900 ms
64 bytes from 94.23.209.91: seq=5 ttl=48 time=167.791 ms
c64 bytes from 94.23.209.91: seq=6 ttl=48 time=116.265 ms
64 bytes from 94.23.209.91: seq=7 ttl=48 time=113.349 ms
64 bytes from 94.23.209.91: seq=8 ttl=48 time=115.693 ms
^C
--- mirror.slitaz.org ping statistics ---
9 packets transmitted, 9 packets received, 0% packet loss
round-trip min/avg/max = 112.723/120.457/167.791 ms
root@slitazCPX:/home/user# rm /var/lib/tazpkg/ID
root@slitazCPX:/home/user# tazpkg recharge
Creating backup of the last packages list... [ OK ]
--2013-02-21 18:30:59-- http://mirror.slitaz.org/packages/4.0/packages.desc
Resolving mirror.slitaz.org (mirror.slitaz.org)... 94.23.209.91
Connecting to mirror.slitaz.org (mirror.slitaz.org)|94.23.209.91|:80... connected.
HTTP request sent, awaiting response... 200 OK
Length: 357447 (349K) [text/plain]
Saving to: `packages.desc'
100%[======================================>] 357,447 211K/s in 1.7s
2013-02-21 18:31:01 (211 KB/s) - `packages.desc' saved [357447/357447]
--2013-02-21 18:31:01-- http://mirror.slitaz.org/packages/4.0/packages.md5
Resolving mirror.slitaz.org (mirror.slitaz.org)... 94.23.209.91
Connecting to mirror.slitaz.org (mirror.slitaz.org)|94.23.209.91|:80... connected.
HTTP request sent, awaiting response... 200 OK
Length: 200142 (195K) [text/plain]
Saving to: `packages.md5'
100%[======================================>] 200,142 154K/s in 1.3s
2013-02-21 18:31:03 (154 KB/s) - `packages.md5' saved [200142/200142]
--2013-02-21 18:31:03-- http://mirror.slitaz.org/packages/4.0/packages.txt
Resolving mirror.slitaz.org (mirror.slitaz.org)... 94.23.209.91
Connecting to mirror.slitaz.org (mirror.slitaz.org)|94.23.209.91|:80... connected.
HTTP request sent, awaiting response... 200 OK
Length: 280844 (274K) [text/plain]
Saving to: `packages.txt'
100%[======================================>] 280,844 177K/s in 1.6s
2013-02-21 18:31:05 (177 KB/s) - `packages.txt' saved [280844/280844]
--2013-02-21 18:31:05-- http://mirror.slitaz.org/packages/4.0/packages.list
Resolving mirror.slitaz.org (mirror.slitaz.org)... 94.23.209.91
Connecting to mirror.slitaz.org (mirror.slitaz.org)|94.23.209.91|:80... connected.
HTTP request sent, awaiting response... 200 OK
Length: 61644 (60K) [text/plain]
Saving to: `packages.list'
100%[======================================>] 61,644 81.0K/s in 0.7s
2013-02-21 18:31:06 (81.0 KB/s) - `packages.list' saved [61644/61644]
--2013-02-21 18:31:06-- http://mirror.slitaz.org/packages/4.0/packages.equiv
Resolving mirror.slitaz.org (mirror.slitaz.org)... 94.23.209.91
Connecting to mirror.slitaz.org (mirror.slitaz.org)|94.23.209.91|:80... connected.
HTTP request sent, awaiting response... 200 OK
Length: 4091 (4.0K) [text/plain]
Saving to: `packages.equiv'
100%[======================================>] 4,091 --.-K/s in 0.1s
2013-02-21 18:31:06 (41.0 KB/s) - `packages.equiv' saved [4091/4091]
--2013-02-21 18:31:06-- http://mirror.slitaz.org/packages/4.0/files.list.lzma
Resolving mirror.slitaz.org (mirror.slitaz.org)... 94.23.209.91
Connecting to mirror.slitaz.org (mirror.slitaz.org)|94.23.209.91|:80... connected.
HTTP request sent, awaiting response... 200 OK
Length: 1859935 (1.8M) [application/octet-stream]
Saving to: `files.list.lzma'
100%[======================================>] 1,859,935 529K/s in 4.1s
2013-02-21 18:31:11 (442 KB/s) - `files.list.lzma' saved [1859935/1859935]
--2013-02-21 18:31:11-- http://mirror.slitaz.org/mirrors
Resolving mirror.slitaz.org (mirror.slitaz.org)... 94.23.209.91
Connecting to mirror.slitaz.org (mirror.slitaz.org)|94.23.209.91|:80... connected.
HTTP request sent, awaiting response... 200 OK
Length: 692 [text/plain]
Saving to: `mirrors'
100%[======================================>] 692 --.-K/s in 0s
2013-02-21 18:31:11 (13.6 MB/s) - `mirrors' saved [692/692]
Mirrored packages diff
================================================================================
No new packages on the mirror.