T-Com Speedport W921V

Board: Arcadyan VGV953

Architecture MIPS
Vendor Lantiq
bootloader U-Boot
System-On-Chip VR9 VRX 288 (MIPS 34K V5.5)
CPU/Speed 34K V5.5 500 MHz
Flash-Chip NAND256W3A
Flash size 32 MiB NAND Flash
Ram-Chip W971GG6JB-25
RAM 128 MiB
Wireless-2,4 XWAY WAVE300 - PSB 8304 V V1.1
Wireless-5 XWAY WAVE300 - PSB 8301 V V1.1
Dect COSIC Modem PMB 9643V V2.0
Modem XWAY VRX208 PSB 80190 V V1.1
Ethernet XWAY PEF 42068 F swconfig
Isdn PSB 21150 F V1.4
USB Yes 2 x 2.0
Serial Yes

WIP!! Due to changes in Kernel partition size there is incompatibility with the previous version. u-boot 0x0 0x40000 256 KByte uboot-env 0x40000 0x20000 128 KByte kernel 0x60000 0x400000 4 MByte ubi 0x460000 0x1ba0000 27,625 MByte

This Build is currently not compatible (or not tested) with the VGV953 builds. Fresh install is recommended.

Serial console is required for conversion to OpenWrt, tftp server that allows uploads (for backup),

All files from Dropbox can be put into root of the tftp (100 MBit! GBit transfer interrupted), Serial is ttyUSB0.

Get UART console by shorting R133 solder pads (no resistor, next to the shield in the middle) and powering on the device. Your terminal must show “CFG 04” somewhere and “UART” in the last line. The R133 short can be removed now.

Upload a special u-boot.asc RAM image using a serial cable (115200-N-8) GUI tools: terraterm (win) or cutecom (linux) use „Send File”.

from another shell, use the latest file (19.07.0) with command:

cat u-boot.asc > /dev/ttyUSB0

When you see “VGV953AKW22” in Terminal, u-boot is loaded.

Backup can be done via tftp (limit the speed to 100M more stable).

3(4) Commands are already configured in the image for backup, restore and u-boot update.

backup=nand read $loadaddr 0 0x2000000 tftpput $loadaddr 0x2000000 vgv953akw22.nand.dump
restore=tftpboot vgv953akw22.nand.dump && nand write $loadaddr 0 0x2000000
update-uboot=run load-uboot-nandtpl-lzo write-uboot-nand
write-uboot-nand=nand erase 0 $filesize && nand write $fileaddr 0 $filesize
VGV953AKW22 # run backup
NAND read: device 0 whole chip
Bytes transferred = 33554432 (2000000 hex)
VGV953AKW22 # run restore
Bytes transferred = 33554432 (2000000 hex)

NAND write: device 0 whole chip
 33554432 bytes written: OK
VGV953AKW22 # run update-uboot
Bytes transferred = 255871 (3e77f hex)

NAND erase: device 0 offset 0x0, size 0x3e77f
Erasing at 0x3c000 -- 100% complete.

NAND write: device 0 offset 0x0, size 0x3e77f
 255871 bytes written: OK

after every update-uboot the device needs to be switched off (SPL: cannot start U-Boot)

Incomplete from here, erase uboot-env necessary “nand erase 0x40000 0x1fa00”

you should see now </code>ERROR: can't get kernel image!</code>

MAC Address is on the PCB sticker and back of the case if not set change XX:XX:XX and set bootcmd setenv ethaddr 9C:80:DF:XX:XX:XX setenv bootcmd run nboot saveenv run netinit

the last command will tftpboot vgv953akw22-initramfs-kernel.bin and start. from there you use the browser and open the WebIF or what way you prefer and perform Sysupgrade.

Power off board.

Short the (R133) and power on the router. Add picture of location, there is no resistor, just pads, next to the shield in the middle.

When CFG 04 UART Popups in terminal You can disconnect/revert R133 short to normal or You can wait till the end of process.

ROM VER: 1.0.5                                                                  
CFG 04                                                                          
EEPROM Data OK                                                                  

Upload a special (uboot-vgv953.asc) U-Boot RAM image using a serial (baud 115200) cable via „Send File”(terraterm for win or cutecom for linux).

Wait for U-Boot to load and stop auto-boot process.


Step 1: Type in console

nand erase.chip

Step 2: Set Your IP addres to “” and start tftp server

Step 3: Place uboot-vgv953.bin in tftp folder

Step 4: Type in console

tftp uboot-vgv953.bin

Step 5: Type in console

nand write 81000000 0 0x{filesize in hex}

Step 6: Reset board

Step 1: Stop U-boot auto boot process and modify to auto boot OpenWrt at power on

setenv nboot 'nand read 0x80800000 0x60000 0x200000; bootm 0x80800000'
setenv bootcmd 'run nboot'

Step 2: Erase NAND

nand erase 0x60000 0x1fa0000

Step 3: Set Your IP addres to “” and start tftp server

Step 4: Place openwrt-lantiq-xrx200-VGV953-ramfs image in tftp folder

Step 5: Upload initramfs image

tftp openwrt-lantiq-xrx200-VGV953-ramfs

Step 6: Run initramfs image and wait till fully booted


Step 7: Wait until boot complet, then upgrade via web with this openwrt-lantiq-xrx200-VGV953-ubifs-sysupgrade

Hint: Ram Image or uncompressed Kernel should be smaller than 4.2 MB or boot will fail with “Uncompressing Kernel Image ... LZMA: uncompress or overwrite error 7 - must RESET” u-boot limitation post links to 18.06.0 initramfs and sysupgrade, Git for master UBIFS recovery on boot message keeps me from pushing it to openwrt currently 18.06.0 files will follow

There are some problems with device.

wifi not working (no drivers for lantiq wave)
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  • Last modified: 2020/01/28 14:41
  • by wingman2k