X98 AIR III curious boot screen

Hi.
Five month old.
Rom stock.
Normal use.
After a wake up i have found this message screen :
EFI SHell version 2.31 [5.8]
Current running mode 1.1.2
Device mapping table
blk0 : BlocDevice - Alias (null)
PciRoot[0x0)/Pci(0x17,0x0)/Ctrl(0x0)
Blk1 : BlocDevice - Alias (null)
PciRoot[0x0)/Pci(0x17,0x0)/Ctrl(0x1)
Blk2 : BlocDevice - Alias (null)
PciRoot[0x0)/Pci(0x17,0x0)/Ctrl(0x2)
Press ESC in 1 seconds to skip startup.nsh, any other key to continue.
Schell> _


After a power down/up this screen still come up.
No keyboard key work.
No connection to my computer, i'm not able to save my documents actually.
No response from Teclast customer service.
Vendor tell me to return this tablet for repair at my charge.
Any help appreciated, big thanks.

Remy