Hi. I used my VIM with Android 7.1. And one day it had hanged on Recovery with message “Can’t mount /cache”. I tried to download another firmware with full eMMC erase, but i had same message. Linux also hangs with black screen. What does it look like?
Did you insert the bootable SD Card?
Can I boot from SDcard if I have 8gb version?
Did you insert SD Card when you hanged on recovery? You can try to remove the SD Card and boot the VIM again. Thanks 
No, i don’t never insert card