connect your device using the serial port at baud rate 115200.
enter the boot loader by pushing ctrl+c

now type:
ensure that a tftp server is running on your configured tftp server location within the bootloader. otherwise change the bootloader
network settings to your location. consider to plugin the network cable on ETH0

instructions for Tonze AP425 :

fis unlock -f 0x50000000 -l 0x00800000
fis init
load -r -v -b 0x00800000 linux.bin
fis create linux


consider to configure the boot script
fis load linux
exec
using fconfig


one time installed, future upgrades can be done with the webinterface using the tonze-ap425-webflash.bin binary

consider that this firmware must be registered. keys can be obtained within our shop at www.dd-wrt.com
if you want to receive one single free evaluation key, just contact us at info@dd-wrt.com