Because of this miserable Wifi I tried the Xwrt Rom with more WiFi Power. I couldnt get it to work properly and now when im back on the old Firmware only luci pops out and i cannot get back the old Web UI for configuration. What can I do. I flashed twice already.
It is browser cache problem.
Clear browser cache, or
use private tab/window, or
use a different browser
Thank you for the answer so quickly. Happy New Year and thanks for all your hard work Team!