You can make a very effective passive cooling system for your DevTerm, if you have access to these three materials: Graphene sheet, Copper foil tape, and Thermally conductive sheet.
Tested on A06 and A04 Cores, CPU temperature lowered by about 10 degree Celsius.
https://github.com/clockworkpi/DevTerm/raw/main/Clockwork_DevTerm_DIY_Graphene_Heat_Sink.pdf