Livebox Next (Arcadyan VRV9510KWAC23)

Hi, so I got a Livebox Next and wanted to flash OpenWrt, but the was no support. It is similar to the livebox 2.1 but it uses broadcom wireless (I know, bad support, but at least wireless G).
I got a serial connection and shorting a resistor I got into UART mode, and first I want to dump the flash. Then I guess I need to flash uboot and then try openwrt. Any help?
I am updating this page with my findings:

I would like some help with this issue: I have booted u-boot using this version (similar router) and the flash is not working right. bdinfo shows size 0x0 and the last 8MB of the 128MB are not readable with nand read.