Has anyone got the download address and instructions for a firmware reflash?
Mine shows this error when I want to access the webinterface:
/usr/lib/lua/luci/dispatcher.lua:582: bad argument #1 to ´pairs´ (table expected, got nil)
[C]: in function ´pairs´
/usr/lib/lua/luci/dispatcher.lua:5882: in function `createtree`
It runs stable over 500GH, but I would like to access the webinterface again

I don't know... If it runs stable at over 500GH, I would leave it alone.
Knock yourself out. If something goes wrong, you have been warned!