No. Oppo F11 does not have the front camera LED flash but it has display screen flash.
Yes, Oppo F11 comes with a hybrid sim slot but it also has 128GB internal storage and OTG support.
Yes, Oppo F11 does have FM radio support.
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.
Yes, Oppo F11 does have a 3.5mm headphone jack.