If you cannot unlock the full version, please tap Settings > Restore full version. (XMind for Android). Please see the attachment.
If it shows "Restore failed", please contact our support center with the following information:
1. XMind ID,
2. The date when you purchased the subscription (year-month-day-hour),
3. Where did you purchase the subscription?
4. Please send us feedback from XMind for Android.