update read me with max fw version compatability

README.md

@@ -17,7 +17,7 @@ Using this project can potentially expose your device to the open internet depen
 * No modification is done to the device filesystem. **_Zero!_** (T31 only)
 * Custom kernel loads all required files from micro-sd card at boot time
 * Easy uninstall, just remove files from micro-sd card, or don't use a micro-sd card at all!
-* Works on ANY firmware release (so far!)
+* Works on ANY firmware release up to 4.36.9.139 (DO NOT UPGRADE BEYOND THIS FW IF YOU WANT RTSP or any `cmd` FEATURES!)
   * Compatability is not guaranteed with really old firmware versions!
   * Update to the latest stable or beta firmware, this mod should still work!
   * Block remote or app initiated firmware updates

SD_ROOT/wz_mini/bin/car_control.sh

@@ -85,10 +85,8 @@ elif [ "$input" = "e" ]; then
 elif [ "$input" = "z" ]; then
 	#reverse left
 	if [ "$1" == "low_speed" ] || [ "$2" == "low_speed" ]; then
-		echo "low speed"
 		echo -ne "\xaa\x55\x43\x06\x29\x76\x3b\x00\x02\x22" > /dev/ttyUSB0
 	else
-		echo "hi speed"
 		echo -ne "\xaa\x55\x43\x06\x29\x76\x36\x00\x02\x1d" > /dev/ttyUSB0
 	fi