scv2020 cannot enable cache

Hello,

at our university we have an old Dell scv2020 storage that we use as secondary storage.

The last year, both batteries went off, so the cache was automatically disabled. 

Specifically since then  we have two alerts (one for each controller) with the text: an unrecoverable problem was found with caching hardware on controller XXXX during system startup.

Also the cache cards status was at off status.

A few days ago, we managed to buy two batteries to replace the broken ones.  After replacing the batteries 

both cache cards went UP (fully charged).

The problem is that the alerts remains even i shutdown and restart the entire storage. 

Under the Storage Settings we still see a message in red saying: write cache is current down on the storage center.

Any ideas, what can i do to restore cache(write/read)??

The storage of course is EOL.

Regards,

akops