i have an r4 card that works fine.decided to buy 1 for a mate. recieved it but doesn't work.only dif,new 1 is an update.keep getting red menu sign on top screen. can anyone help.....plz
Incorrect firmware - there are 25+ R4 cards, a lot with similar or the same name. Try them all - 1 will usually work. Format with panasonics SD formatter between each firmware and extract the file (unzip it) directly on to the card. This seems to give you the best chance of getting something that works