Install kodi krypton

Hey guys, I need help.
I purchased a streaming box V88 4k. It comes with kodi 16.1 jarvis
Already installed and it’s an android 5.1.1 operating box.
I uninstalled the 16.1 and installed the 17 krypton very easily.
Changed to a skin that I didn’t like and couldn’t change it back to the original one and it got froze so I had to reset the box and now I don’t know why it won’t give me the option to install the 17 krypton ver. Only 16.1. Can anyone help me how to fix this?