Strange chinese menu on Lenovo IdeaTab S6000 Context

I just Skyped with my mother (far away) because her Android tablet (Lenovo IdeaTab S6000, running on Android 4.2) showed a strange menu with Chinese characters, almost like a bootloader. My short troubleshoot history looks like this:


When pressing the volume-keys, the displayed content changed, at one point the text contained "GPS", so I assumed it would be some kind of "hidden troubleshoot menu" for showing system information.
A restart was possible after pressing and holding the standby-button, after restarting everything seemed untouched.
Just to make sure, we changed her passwords.
She did not visit any suspicious websites, nor did she install any apps recently.


With my little knowledge, so far I do not feel able to rule out an attack or a trojan app, from what I can see she could have activated the strange menu by accident. Via internet research I only found one individual with the same problem, but no solution at all.

Question(s)

What can I do to determine the cause? Should I contact the provider/manufacturer? Is it safe to assume that her data &amp; accounts are not compromised?

I know it is little information, so please bare with me, I just want to prevent damage.

Thanks for any advice.

TL;DR

Lenovo IdeaTab showed strange chinese/asian-symbols-menu, gone after reboot, do what now?
What can I do to determine the cause?


The user just accidentally accessed the Factory Mode on Lenovo tablet.

It can be accessed by:


Turn off the device
Hold "Volume Down", then connect the USB




(Image courtesy of XDA)

As a proof, there is a text containing "GPS" like you mentioned.

For the translation of each menu, you can refer to the post on XDA forum (also, source of this information).


  Should I contact the provider/manufacturer?


If the user didn't do anything on this menu, then I believe you don't need to contact the provider/manufacturer since nothing happens.


  Is it safe to assume that her data &amp; accounts are not compromised?


I believe no data are compromised. Factory Mode is usually related to device testing/configuration, but not individual user data.