Hi, any sifus can give workaround to my problem.
previously for 1 year, i'm able to use the Maxis 4G backup SIM with my LTE D-link router for internet (no configurations needed, just plug & play)
Until last month, the backup SIM can't work anymore with my LTE router
Now the backup SIM can only work with Maxis provided router (AMINIA brand)

is there any workaround to get the backup SIM to work with other routers?

much appreciated if there is any guidance.
many thanks in advance.

The use of backup SIM in the D-link router provided me Internet for me to work in another place.
times are bad for me now so if i can use the backup SIM in my existing router for internet, that can saved me some money in these troubling times.

Anyway, i appreciate all the feedbacks given, Thanks all.

my current experience with the backup SIM. It seems that Maxis are aware of users using this backup SIM & have made the backup SIM to detect the router IMEI & also your physical location. for my case, only can use the SIM in the original router & also only at the designated location.