Microchip MPLAB® X IDE requires specific information to support devices and tools. This information is contained in versioned packs. For the AVR128DB48 Curiosity Nano, board MPLAB® X version 5.40 with device family pack “AVR-Dx_DFP” version 1.2 and tool pack “nEDBG_TP” version 1.1 or newer are required. For more information on packs and how to upgrade them, refer to the MPLAB®X IDE User’s guide - Work with Device Packs.