Hi ESP_Angus,

Thank you for your quick reply and your patience to read my post.

I think I fix this issue. I'm not really sure but it's seems that the CP2102 on board is little lazy. Today I try to load code with real external UART (FTDI) and bypass the CP2102. Five tries to flash, five success ...

hello,

I'm very beginner with ESP32 and to learn in deep I downloaded all the PDF datasheets + bought 3xTTGO (ESP32-WROOM+OLED+CP2102+BMS) on Aliexpress ( https://www.aliexpress.com/item/32956865037.html?spm=a2g0s.9042311.0.0.1ec64c4dN31Vn3 (poor quality).

I started to play with one of them with ...