I am having the same issue as the rest. In an attempt to try as many suggestions as possible, I am currently [for the moment at least] having success using the process outlined by floflooo in the link below.
Basically, I removed a member of my array [sdb, as that was showing as faulty] and then followed the process to add in a new disk. So far my recovery is at 3.x% [a threshold i never reached with the other methods].
I’ll update again as it either fails or completes.
I got up to about 10%, but then the device went into a cyclical reboot [watched the lights reboot 3x before…]. I powered it down, reseated the mSata adapter and booted back up. It loaded and resumed the recovery successfully… then failed as per the standard issue within the next 10 mins. sigh…
On a subsequent reboot, it mounted and began the recovery @11.x%. will keep watching it…
I have had to reboot 2x more times, but it is still progressing, currently ~20.x%… [another cyclical reboot around 60%, but it did complete and shows a healthy array as of this morning]