Yes, in fact, the Chinese cabbage U disk boot system only needs one storage medium, and many things can meet this condition, even SD card, TF card, MP4 and mobile hard disk. After production, you can start normally as long as you choose the correct startup mode.

However, after reading your doubts about others, I feel that although it is possible, it is basically impossible, because you still have to make a USB flash drive to start it. On the one hand, it can't be operated on the mobile phone system, and on the other hand, it needs the next system image to recover.

If the mobile phone has a TF card, it is recommended to buy a card reader, extract the GHO from the next system ISO in the Internet cafe, make it into a startup disk, and then put the GHO into the TF card, so that it can operate normally at home without too much budget.