Huawei Router WS5200 V2 - Get shell

I found TX and RX on the board and basically I want get the UART shell but if i boot I'm only able to the bootlog, is possible to get the shell?


this is the bootlog:

Ubuntu Pastebin

I'm also trying to get the firmware from huawei for a small reverse engineer

Huawei (Europe) said me that they don't have at all the firmware, so I can't download it