At this moment the Lenovo IdeaPad Slim 1-1AST-05 Model 81VR can only be booted via Text mode.
Once booted in text mode the machine can be wiped.
See here how to get in text mode:
If you have any issue during the setup of the software, config files or anything else, please contact us via one of below options.
Our official support hours are 8:00 am to 16:30 pm, after those hours emailing us or submitting a ticket would be the best option.