It could be that there is an error in the background that prevents booting. I'm afraid you have no other option but to reset the device via recovery mode. You can get more information by clicking on the banner below.
this time I hit the recovery and left it. after about a minute a picture of a electric motor came upthen it went out and now the oukitel screen is back on.
I will lgo to bed now and see what happens in the morning.
If there is no way to recover even via recovery mode, then I'm afraid it's due to a deeper bug in Android itself. Here probably only a visit to a repair store would be of any use, as a rom must be installed if necessary.
We don't advise you to flash the device yourself.
Unfortunately I don't have any further information.