First thing need to clarify:
GDR2: Grand Distribution Release 2 by Microsoft for WP8.
Unlike the first GDR1 (Portico), where Microsoft release the update to phone owner by themselves.
But after GDR1, Microsoft had changed policy and will release the GDR to all WP8 phone manufacturer (Nokia, Samsung, HTC, Huawei), let the phone manufacturer doing their own hardware testing and may bundle it with their own firmware update, so different phone manufacturer will release GDR2 update different time.
For Nokia, Nokia choose to bundle it with their own firmware update (Lumia Amber) and release it to all Nokia WP8 phone owner.
So if you had Lumia Amber firmware on your phone, your phone had already updated with GDR2. Since the GDR2 is bundled inside Lumia Amber update when you download it.
thanks for the explaination bro. so my phone is updated to the latest one right.
I thought Amber have FM radio, but I cannot find it.