Giuseppe123

I have an XR500 that gave a firmware problem, I tried several times to reinstall several versions and it didn't work. I saw in a forum to install the R7800 firmware that the size is smaller and the chance of installation would be greater, and it really worked, but now I'm trying to go back to the xr500 firmware that was before and it doesn't work! What can I do to return the xr500 firmware with dumaos?