@talkron You just need a standard USB Drive (Flash Disk ) nothing fancy or special. The old smaller USB2 versions will do just fine. Format it FAT32 in a PC and you are ready to go. Zidoo FW's don't allow downgrades just upgrades (not to my liking) . The only way to go back is doing an Emergency Flash which has a different procedure following pressing the reset PIN during power-on. Procedure with detailed instructions can be found here too.