I have 2 x Raspberry Pi 3s (mine is a 3B, his 3B+). I cloned my SD card for a friend, and the new card works in my Pi. His Pi will only boot to the rainbow screen.
Solid red light on the back. The only difference is I used the Power Supply that came with my kit, and he used a third party one.
Also, when I cloned my card, and reinserted it, it keeps seeing it as two drives. In my This PC, it shows "boot (E:)" with 36.6MB free of 56.8 MB. And it shows USB Drive (G:) with nothing below it. And every time I insert the card into my computer, it tells me I have to format the G: drive to use it. Which I've done. Multiple times. I've cleaned the extra partition and them reformatted... nothing.
I'm super confused here, and I'm a relative noob... so please help a girl out?