Here is X300 DP PLUS 8 inch tablet register and update guidence.
Note: Turn on the power and connect to the network before registering
1. Click DP
2. Click Personal center
3. Click Register
4. Fill in personal information
5. After successful registration, log in to your account
6. Click upgrade
X300 DP PLUS How To Registration and Upgrade
https://blog.obdii.shop/x300-dp-plus-how-to-registration-and-upgrade/