Updated How to upgrade flash 4G ext firmware (markdown)

How-to-upgrade-flash-4G-ext-firmware.md

@@ -57,6 +57,60 @@ If there is no device information, the operation must be halted.
 
 Then, use `./flash.sh` from the compressed package to flash the firmware, which should take about **40** seconds.
 
+here is the output of flash.sh
+
+```
+cpi@raspberrypi:~/LE20B04SIM7600G22_cpi $ ./flash.sh 
+sending 'aboot' (447 KB)...
+OKAY [  0.018s]
+writing 'aboot'...
+OKAY [  0.563s]
+finished. total time: 0.583s
+sending 'rpm' (156 KB)...
+OKAY [  0.008s]
+writing 'rpm'...
+OKAY [  0.064s]
+finished. total time: 0.072s
+sending 'sbl' (210 KB)...
+OKAY [  0.010s]
+writing 'sbl'...
+OKAY [  0.089s]
+finished. total time: 0.099s
+sending 'tz' (514 KB)...
+OKAY [  0.020s]
+writing 'tz'...
+OKAY [  0.175s]
+finished. total time: 0.195s
+sending 'modem' (36096 KB)...
+OKAY [  1.143s]
+writing 'modem'...
+OKAY [ 11.450s]
+finished. total time: 12.593s
+sending 'boot' (5536 KB)...
+OKAY [  0.179s]
+writing 'boot'...
+OKAY [  1.744s]
+finished. total time: 1.925s
+sending 'system' (51072 KB)...
+OKAY [  1.616s]
+writing 'system'...
+OKAY [ 17.308s]
+finished. total time: 18.924s
+sending 'recovery' (6010 KB)...
+OKAY [  0.193s]
+writing 'recovery'...
+OKAY [  1.893s]
+finished. total time: 2.086s
+sending 'recoveryfs' (10240 KB)...
+OKAY [  0.328s]
+writing 'recoveryfs'...
+OKAY [  3.229s]
+finished. total time: 3.558s
+rebooting...
+
+finished. total time: 0.005s
+```
+
 Once the flashing is completed, the device will automatically reboot, and the LED on the back will light up again.
 
 At this point, run "sudo dmesg |tail" to check for the following output: