When Android is not booting – bootloop with teclast logo:
go to boot menu “Insyde H2O Menu” then click on android logo – hold volume down (constantly) + click OK
Then select “RECOVERY MODE” – tablet restart to Insyde H2O Menu – click to Android icon and OK…. you get android recovery
Now you must “wipe data/factory reset” and “wipe cache partition” and “reboot system now” 😉
I only use android. It still falls down system. Tablet is a terrible shit 🙁 I will try to return it to gearbest!