OK this is what I got
Rew452@RT-AC5300-9DD0:/tmp/home/root# sh -x /usr/sbin/sig_update.sh
+ nvram get apps_wget_timeout
+ wget_timeout=3O
+ wget_options=-q -t 2 -T 3O
+ nvram set sig_state_update=0
+ nvram set sig_state_flag=0
+ nvram set sig_state_error=0
+ nvram get rc_support
+ grep -i nt_center
+ IS_SUPPORT_NOTIFICATION_CENTER=
+ [ != ]
+ nvram get bwdpi_sig_ver
+ current_sig_ver=2.152
+ echo 2.152
+ sed s/\.//g
+ current_sig_ver=2152
+ echo 2152
2152
+ echo 2152
+ nvram get sig_type
+ sig_type=FULL
+ [ FULL == ]
+ nvram get apps_sq
+ forsq=
+ nvram get territory_code
+ tcode=US/06
+ [ US/06 == ]
+ territory_type=US/06_FULL
+ [ == 1 ]
+ echo ---- sig update real normal----
+ wget -q -t 2 -T 3O
https://dlcdnets.asus.com/pub/ASUS/LiveUpdate/Release/Wireless/sig2nd_update.zip -O /tmp/sig_update.txt
wget: --timeout: Invalid time period '3O'
+ r=2
+ [ 2 != 0 ]
+ echo Download sig info Failure, return_code : 2
Download sig info Failure, return_code : 2
+ echo Download sig info Failure, return_code : 2
+ nvram set sig_state_error=1
+ nvram get sig_state_info
+ update_sig_state_info=2152
+ nvram get sig_last_info
+ last_sig_state_info=
+ [ == ]
+ nvram set sig_state_error=1
+ nvram set sig_state_update=1