Need help: OnStepMiniPCB Rev. 1.27x.; ESP-01 flash lost after flashing the Teensy board

Roman
 

Hello Group,

In my OnStepMiniPCB, Rev. 1.27x, after the flashing the teensy board, the flash in the ESP.01 board will be lost! What is the cause and what can I do about it?

Thank you very much for help!

Kind regards
Roman

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