diff --git a/Sonoff-4CH-Pro.md b/Sonoff-4CH-Pro.md
index 96afbb80..f8d522b8 100644
--- a/Sonoff-4CH-Pro.md
+++ b/Sonoff-4CH-Pro.md
@@ -27,7 +27,7 @@ On the R2 module the GPIO0 pin is broken out to [a small pad to the right of the
 If you have problems to program the 4CH Pro, you might find below tips useful:
 * Use the ESP program header and ensure that the right port is set in the Arduino IDE. 
 * TX/RX are printed correctly on the pro version => TX goes to RX PIN and RX to TX.
-* GPIO0 needs to be connected to ground for 3 seconds after reboot! If not you can not program it.
+* GPIO0 needs to be connected to ground the first 3 seconds during reboot (or longer)! If not you can not program it.
 
 1. If you use Windows7+, check in the device manager if the port is not added/removed all 2 seconds.
    - If yes then your USB port does not deliver enough ampere.
@@ -35,6 +35,9 @@ If you have problems to program the 4CH Pro, you might find below tips useful:
 3. Use an active USB HUB if your computer delivers not enough ampere
    - External power source will stabilize the 4CH-pro and you can increase upload speed back to 115200.
    - Using a Laptop instead of a Desktop Tower might also do the trick as Laptops have a battery to deliver more ampere.
+4. you can not flash it with sonoff-minimal.bin, you need to flash it with sonoff.bin ! Using esptool following commands might be usefull (you need to change com port) 
+to clear: esptool.exe -cp COM6 -cb 115200 -ce -v
+to program: esptool.exe -cp COM6 -bm dout -cf sonoff.bin -v
 
 ## 4CH Pro DIPSwitch Configuration