I suggest you re download the ROM, using a different site/method, and don't use a download manager of any kind and stick with your browsers built in one. Backup any games you have to your computer, then search for "Panasonic SD formatter" download it, and install, insert your microSD card and run the tool. click format and once done you can redownload the wood firmware. if you don't have a program to manage .zip files then get 7zip and use it to extract the ROM and the Wood firmware. Copy over the games and the newly downloaded wood firmware, eject the SD card and go test to see if it works.