H410 keypad does not respond after a project download (elimination)

Which products are affected?

ESP-HMI1-P with SP1 (HMI Designer Version 1.6 with Service Pack 1)
EPM-H410 (Graphical display unit with input keys)

Eliminated function restrictions:

After a project download the project is stared by the H410 keypad but it does not respond as programmed. The three LEDs Bus Error, Power and Battery indicate the corresponding keypad status.

URL for linking this AKB article: https://www.lenze.com/en-de/go/akb/200401250/1/
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