CEL recommends customers use the 10-pin Insight port and an Ember Debug Adapter (ISA3) to load or debug software. Please see the ZICM35xSPx Hardware Design Guidelines for the recommended connector and the debug port pin connections.
CEL also sells a programming fixture that can be used for programming in conjunction with the Ember Debug Adapter (ISA3). Please see the ZICM35xSPx Programming Fixture application note located here for more details. Please contact us here for pricing and availability.
Silicon Labs offers two software tools for programming:Ember® EM35x Utilities Guide for the EM35x SoC Platform
Ember® Debug Adapter (ISA3) Technical SpecificationWith both options you can use the ISA3 debug port in conjunction with the Ember Debug Adapter and reprogram the modules using Ember Desktop (Ethernet) or the ISA Utilities (USB) provided by Silicon Labs.