SparkFun ScL line to D2 ESPWROOM32 causes flash to fail

[vibnwis]

I have SparkFun combo CSS811 BME280 board. Recently I experience, flash always fail. I have D2 line connected to SCL of Combo board. As soon as I pulled out the SCL line to D2, it works.I connect it to D23, D1. They work too. I have not tried on other pins, I am running the Kolban's hello program which has not run yet. As the issue is flashing.

Has anyone experienced similar thing?

[WiFive]

Gpio2 is strapping pin must be low to go into flash download mode so i2c pull-up is conflict. Check esp32 datasheet

[vibnwis]

Thanks for the info. Should have checked it myself.

Thank you