a good summary of the current situation and available options is among the links Vinny provided:
https://www.freemovement.org.uk/visit-v ... al-review/
If there are factual mistakes in the refusal decision and the ECO didn't consider positive evidence your boyfriend could:
a) write to the Entry Clearance Manager pointing out the above and requesting reconsideration at the same time threatening JR if a review is not carried out, or
b) actually start the pre-action protocol for the JR which may result in a reconsideration (without having to go through the whole lengthy JR process).
If there are no contact details on the refusal letter your boyfriend could contact the ECM:
by writing to the visa application centre in Beirut, or
by email through the International Enquiry Service, or
writing to the ECM c/o the British Embassy where the Decision Making Centre is (likely to be Istambul but ask the VAC)