Yes, Oppo F11 does have FM radio support.
Yes, Oppo F11 does have a 3.5mm headphone jack.
You can record up to 1080p resolution HD videos on Oppo F11 rear camera. Additionally, you can also record up to 720p resolution videos with the front camera of the mobile.
Yes, Oppo F11 does have support for the fast charging. The mobile comes with VOOC 3.0 enabled the fast charger. It charges almost 20% faster than the regular fast chargers available in other mobile phones.
No. Oppo F11 does not have the front camera LED flash but it has display screen flash.