I have BSNL broadband internet connection at my home. I always use to do some hacks to speed up my internet connection.Just for curiosity i opened my ADSL router (which many people call modem).
Note: If your have problem related to ADSL Link Look at this post, which will give your trick to make your ADSL Link constant.
I just opened that router using philips screws driver, there was no seal or any such other matter which may cause WARRANTY VOID situation for my router.so i opened it without any fear.
This is how it looks from outside
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