As always, prior to updating, create a backup of your USB flash device:  "Main/Flash/Flash Device Settings" - click "Flash Backup".   Besides bug fixing, most of the work in this release is related to upgrading to the Linux 5.9 kernel where, due to kernel API changes, it has become necessary to move device spin-up/down and spin-up group handling out of the md/unraid driver and have it handled entirely in user space.  This also let us fix an issue where device spin-up of devices in user