BPI R4 Pro became unusable with UART not working

Hello! I received new revision of be14 today so I tried to put it in bpi r4 pro. Usually I use other router in bridge mode to open luci configuration or set things through console port. However after installing be14 I can’t get any data from console port anymore. Also other router doesn’t help open luci web page. I tried to connect through Ethernet - LEDs are working but no working dhcp or any signs of life except interface shows up in client PC with state up, connection to 192.168.1.1 is not possible.

I tried different sdcard images, booting to nand, emmc. I removed be14 and disabled 12v power to mpci slots. But still I can’t connect to router at all. All I see is working fans, green light “PWR”, red light alongside green one first seconds after powering on router, mgmt port is constantly shows yellow light and 2.5gbit ports show green or yellow lights if they are connected to PC. Also cpu is warm and be14 shows power light if it is attached to board.

What else should I do to recover router from this state? Is it still possible to connect to it?

Besides the Type-C interface for debugging, the R4Pro also has a TTL serial port you can try.