i did all right...
Tried to install with MIOSPatchingWADInstaller, RVL-mios-v5.wad.out in root of SDcard
And tried to install with WADManager, RVL-mios-v5.wad.out in WAD folder of SDcard
Few people got errors with MIOSPatchingWADInstaller, so they try with WADManager, then re-try with...