Cannot remove LUN of CX4-240 after all drives relatives have been failed

Hello guys, I have an CX4-240 (out of production) when I have a sequence of drives failures and some entire LUNs stuck in failed state.

As this data isnt important now, I want delete all LUNs and and recreate with my health disks, but LUNs that have all disks faileds refuse to be deleted.

Some trick?

BTW, have some procedure to "factory reset" a CX4-240? Maybe it is an easy mode to I start again with an empty storage. Of course, I dont have EMC warranty/support anymore.

Thanks in advance