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If the screen turns out blank when trying to use KDS that means that the software on the tablet is to outdated and its therefor not possible to use it and the current software needs to be updated or new hardware is needed.

*Chrome 87 is compatible with Android 5.0 (Lollipop) and later versions.
*Safari 14 is available on iOS/iPadOS 14 and later. Therefore, it requires an iPhone 6s or later, iPad Air 2 and later, iPad 5th generation and later, all iPad Pro models, and iPad mini 4 and later.
Chrome >=87
Firefox >=78
Safari >=14
Edge >=88