Update flashing.md

doc/flashing.md

@@ -233,12 +233,32 @@ If all went well, the final log output in esphome-flasher looks somewhat like th
 
 <img src="images/17_flash_ready.png" width="400">
 
-If you want to flash with esptool, you can use:
+If you want to flash with esptool, you can use the following command.
+
+*Note: This is probably not correct to get the lamp fully operational. This
+does not update partition table and the bootloader, which are also needed to
+get a functioning ESPHome device. Unless you know exactly what you're doing
+with esptool here, I recommend to use the esphome-flasher instead.*
 
 ```
 python.exe .\esptool.py --chip esp32 --port COM3 --baud 115200 write_flash 0x1000 <path\to\yourfirmware.bin>
 ```
 
+*The following is a bit more in the direction of the required command
+for flashing. If you have some definitive info on how to handle this best,
+please let me know.*
+
+```
+python esptool.py --chip esp32  \
+    -p /dev/ttyUSB0 --baud 115200 \
+    --before default_reset --after hard_reset \
+    write_flash -z --flash_mode dout --flash_freq 40m --flash_size detect \
+    0x1000 bootloader_dout_40m.bin \
+    0x8000 partitions.bin \
+    0xe000 boot_app0.bin \
+    0x10000 ~/Downloads/firmware.bin
+```
+
 After flashing, power down the lamp, disconnect `GPIO0` from GND and
 reconnect the power to boot into the new ESPHome firmware.