RAID is not a replacement for a backup! Here's why.
The last issues was solved but a new issue comes.
I found that in the admin apge, the ssh option is grey out and I cannot open it,
it means I cannot install anything on my own, what on earth is going on?
No idea whats going on here, but my guess is that you never did a hard reset on the unit. I use dd-wrt on my wzr-hp-g300nh's and never have had a problem where SSH is greyed out.
I would try the alpha version of firmware.
Thank guys for your replies,
but due to a performance drop I have rollbacked to 1.76 the official firmware.
dd-wrt is not an option at the moment for me.