hi, I have a few stm32f429i discovery old version, they work by USB connection to PC (for power) or by 5v external power supply(without USB connection )

[MH Salehi]

recently I bought some new version (disc1) these start working by connecting USB,

but they don't start by 5v external supply without USB connection to PC,

I have to connect USB connection to PC and external 5v to proper pin then it starts working , now I can separate USB and it continues working by single 5v external supply,

how can I fix this?( wants to work standalone by external 5v only)

best regards

[Tesla DeLorean]

Make sure you are using current ST-LINK firmware, I think V24 or V25 held in reset with USB battery/charger type supplies.