How to upgrade by USB stick:
	 copy the usb_upgrade_app.AP to usb stick root, then plug-in the stick to device
	Normal method:
	1. enter to Main Menu->USB->Software Upgrade. All the *.AP files will be listed in the dialogue, Please select usb_upgrade_app.AP.
	2. press OK to confirm and the device will go to upgrade mode
	3. the device will reboot automatically once the upgrade process finished
	4. please check the software version on Main Menu->System menu
	
	
	Note: Please do not power off the device during upgrading.
	
release date: 29.10.2019
release version: 4.2.4

modifications:
	1. update satellites 

	
