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Přes RS232 se připojíš na konzolu routeru pomocí nějakého terminálového programu (Putty, CRT, Minicom...), vlezeš do bootloaderu (na SoC Atheros většinou bývá U-boot, resp. já jsem tam jiný ještě neviděl, pokud nepočítám Routerboardy a jejich RouterBoot) a přes X-MODEM nebo TFTP tam nahraješ příslušný firmware.

Žádné flashovací utility netřeba, vše se provede pomocí bootloaderu. Na terminálu uvidíš něco takového: 

U-Boot 1.1.6 (Apr 14 2010 - 14:02:36)

DRAM:  ar7100_ddr_initial_config(237) enter!
ar7100_ddr_initial_config(269) exit!


U-Boot 1.1.6 (Apr 14 2010 - 14:02:36)

AP81 (ar7100) U-boot
sri
32 MB
WRT160NL u-boot version: 1.0.0
Top of RAM usable for U-Boot at: 82000000
Reserving 279k for U-Boot at: 81fb8000
Reserving 192k for malloc() at: 81f88000
Reserving 44 Bytes for Board Info at: 81f87fd4
Reserving 36 Bytes for Global Data at: 81f87fb0
Reserving 128k for boot params() at: 81f67fb0
Stack Pointer at: 81f67f98
Now running in RAM - U-Boot at: 81fb8000
id read 0x100000ff
flash size 8MB, sector count = 128
Flash:  8 MB
In:    serial
Out:   serial
Err:   serial
Net:   ag7100_enet_initialize...
ag7100 get ethaddr for device eth0
No valid address in Flash. Using fixed address

 --------***** Get the RTL8306SD Manufactory ID=379c *****-------
 Reg6: speed=0 nway=1 duplex=0
 Reg5: speed=0 nway=0 duplex=0
 Reg1: a1=7fd9 a2=30e0 a3=15ac a4=30e0 a5=0
 Reg1: a1=7fd9 a2=30e0 a3=15ac a4=30e0
 Reg1: a1=7fd9 a2=30e0 a3=15ac a4=30e0
 Reg1: a1=7fd9 a2=30e0 a3=15ac a4=30e0
 Reg1: a1=7fd9 a2=30e0 a3=15ac a4=30e0
eth0: 00:01:36:22:7e:f1
eth0 up
eth0
### main_loop entered: bootdelay=1

Hit any key to stop autoboot:  0 
ar7100>
ar7100> help
?       - alias for 'help'
autoscr - run script from memory
base    - print or set address offset
bdinfo  - print Board Info structure
boot    - boot default, i.e., run 'bootcmd'
bootd   - boot default, i.e., run 'bootcmd'
bootelf - Boot from an ELF image in memory
bootm   - boot application image from memory
bootp   - boot image via network using BootP/TFTP protocol
bootvx  - Boot vxWorks from an ELF image
bootwrt   - boot WRT160NL application image from memory
chpart  - change active partition
cmp     - memory compare
coninfo - print console devices and information
cp      - memory copy
crc32   - checksum calculation
dhcp    - invoke DHCP client to obtain IP/boot params
echo    - echo args to console
erase   - erase FLASH memory
exit    - exit script
flinfo  - print FLASH memory information
fsinfo  - print information about filesystems
fsload  - load binary file from a filesystem image
go      - boot default, i.e., run 'bootcmd'
help    - print online help
iminfo  - print header information for application image
imls    - list all images found in flash
itest   - return true/false on integer compare
loadb   - load binary file over serial line (kermit mode)
loads   - load S-Record file over serial line
loady   - load binary file over serial line (ymodem mode)
loop    - infinite loop on address range
ls      - list files in a directory (default /)
md      - memory display
mii     - MII utility commands
mm      - memory modify (auto-incrementing)
mtdparts- define flash/nand partitions
mtest   - simple RAM test
mw      - memory write (fill)
nfs     - boot image via network using NFS protocol
nm      - memory modify (constant address)
ping    - send ICMP ECHO_REQUEST to network host
printenv- print environment variables
protect - enable or disable FLASH write protection
rarpboot- boot image via network using RARP/TFTP protocol
reboot   - reboot the device
run     - run commands in an environment variable
setenv  - set environment variables
sleep   - delay execution for some time
test    - minimal test like /bin/sh
tftpboot- boot image via network using TFTP protocol
upgrade- upgrade bootcode, code.bin, rom.bin and mfg.bin via using TFTP protocol
upgrade <boot.bin|code.bin|rom.bin|mfg.bin>
version - print monitor version
ar7100>