You could try clean disk for any mbr, gpt hiden partion. In windows, open command prompt as administrator, type diskpart (be carefull), issue command: list disk (all your disk will be display with a number). Now choose carefully your disk and input: select disk n where n is your thumb drive number ( carefull next command will destroye any partition) type command: clean. You can now format the disk with windows explorer. This method will realy clean your disk to factory state.
And other tough, when copying image on thumb, even if in windows close the transfert file wait before removing your thumb. When using a thumb with led you will notice it take few second before led flash stop.
Clean the thumb drive is usefull when you use your thumb drive to install or update windows or linux for example. Thumb use for those purpose are modify with hidden partition. So more than one partition are present but are hidden you could use the drive, format it but hidden partition are still present. Just a way to reset your thumb drive.
Tashman, I think Sarco says "thumb drive" meaning "external USB pendrive", not the internal X9S memory.
Thank you! Unfortunately it does not help. I have a USB flash drive with led indicator, but he did not even blink.
No one has. because it was designed to be flashable using USB Stick . x6 pro was flashable using USB male to male OTG cable. but the tools will probably not work with x9s.