You need to first download the Windows rom from the download area: https://www.mediafire.com/folder/hq5rdie5ssr8lbg,u68nd5tmlp8icvc,c55a1yeha6w0uqi,yuwi6xhdi4lyxh7,v9z09qkxt1jpz9w/shared
Once you have it, you must unzip it and copy it to a pendrive, of at least 16GB in NTFS format and rename it to WINPE.
Then turn on the tablet with the pendrive on and pressing F7 (can be Fn and F7) intermittently without stopping until the boot selection menu appears. In it, choose the USB stick.
An automatic process will start after a few seconds with the black screen. When finished, turn off and on again without the flash drive. Everything should work then