Naono 5G Firmware Bug 1.0.2

After upgrading nano 5g from firmware 1.0.1 to 1.0.2, the maximum volume limit lock stopped from working.

I have tried to restore the complete unit from start (completely erasing all settings) two times without success 😟

After that i reverted to old original 5G firmware 1.0.1 and the problem disappeared. The maximum volume lock setting is working correctly in the old firmware, but not in the new one...

Because for children this is a must have feature, bye bye for fimware 1.0.2 for me 😟