Android Go for Honor 4X Che2-L11

Android Go for Honor 4X Che2-L11
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Hello,
I have an Honor 4X with Android 6. I have an issue with my VPN application, Windscribe that won’t work correctly.
I want to flash a custom ROM on this device to Android 8.1 or 9 Go Edition. I found ROM files on mokeedev.com but I’m not sure about

  1. Can I restore pre-installed Android 6 if custom ROM does not work?
  2. 8GB storage is enough for these custom ROMs?
    Regards,
    xyz100