How to Flash?
Use esptool.
First of all, please install esptool from here: https://github.com/espressif/esptool
Download the latest binary file
Now you need to open the BLE-9100 and find the ESP32 Chip.
The Groundcable to th -Pin of the Battery
The TX Cable to RX-Pin of and the RX Cable to the Tx-Pin of the ESP(Pin 34,35).
like in the Photo.
Put in the Batterys and execute this command:
esptool.py write_flash 0x0 ./BLE-9100_XXX.bin
and Done :-)