Ive been using the Arduino IDE to change the speed of the attiny by clicking install bootloader. But finally figured out how to do it in PlatformIO too.
in your platformio.ini place the following
[env:myenv] platform = atmelavr framework = arduino board = attiny85 upload_protocol = stk500v1 upload_flags = -P$UPLOAD_PORT -b$UPLOAD_SPEED upload_port = COM12 //REPLACE WITH YOUR COM PORT upload_speed = 19200 lib_deps = # Using a library name
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