Hello,
I have stoped my 2 BKX for 2 month. This morning I put them on but there is no activity. (No device running, no pools loaded).

Pools are good setup.
I can ping any server from Baikal, no IP problem.
Thank you
Make and export backup. Flash uSD card with newest firmware. Restore backup.
99% it will be solved, because You will also reconnect OrangePC during procedure.