After a power failure QNap TS-H1283XU-RP does not restart

Hi

After a power outage the unit did not respond to the network on any port.
When rebooting without the disks the unit restarts in DHCP stating that it is not initialized and asking to reconfigure it completely.

Is there a procedure to recover the data on the HDDs?

QNap Model: TS-H1283XU-RP
Firmware: 5.0.1.2376 build 20230421
Raid 5 ( 8 HDD) + 4 SSD as cache

Thanks in advantage.

https://forum.qnap.com/viewtopic.php?p=872692#p872692