Rasberry PI 4 B 8GB bricked after latest HA update

Dear All,

I have a rasberry PI 4 b 8GB ram and a micro SD card 64GB with HA OS.
Last week I tried to update the HA to its latest version and left home for the weekend.
I came back yesterday and the Rasberry PI does not react, HA is not reachable through LAN.
I tried a restart, changed the power supply change the ethernet cable but nothing, the device turns on teh LAN orange led blinks slowly but I have no acces sto my HA.

Please help me to restore my HA system.
Thank you in advance.

Have you tried a new raspbian os install on a new sd card?