Snom TFTP recovery update

# download firmware image
wget http://downloads.snom.com/fw/snom320-8.7.5.35-SIP-f.bin -O /var/lib/tftpboot/snom320.bin

1. restart phone
2. wait for "To update by TFTP, press any key: 3 - 2 - 1"
3. press a key
4. set phone IP
5. set tftp server IP
6. set gateway
7. set netmask

Links
http://wiki.snom.com/Firmware/Update/TFTP_Update#Recommended_Update_for_Snom3xx_using_Pumpkin
http://wiki.snom.com/Firmware/V7/Recovery