Process to change after reset
Step 1
Download file from
https://www.sing4g.com.my/product-page/update-file
Apply coupon 'S4G1'
Step 2
From you PC, connect to wifi of the modem
Step 3
After connect wifi, open 192.168.8.1 to see if you can in setting page
sample like below

if can go in setting page, open the file you download
Procedures like

Step 1: enter '1'
wait
Step 2: enter '352419098480482'
Step 3: enter '1'
Step 4: enter '1'
Modem will reboot and it is done