upgrade instructor

A、 Restart the DVR ，press * to Enter the TFTP menu again ,
Type “run da” to upgrade armboot software, it will take about 30-40 seconds
Do not use this command if not necessary
B、 Wait until you see s3c2510 # in the screen again
Attention: Never do anything that will stop the upgrade armboot
Such as : power off the DVR , disconnect the network ,
disconnect the RS232 cable