The IG reports states that it found many problems with the way the FBI conducted itself ... but overall did nothing wrong....
... despite some of those problems being, not vetting sources of information, not disclosing information to the FISA court about those sources of information, misrepresenting information to the FISA court or misleading the court and outright ignoring exculpatory information that would exonerate Trump of wrong doing.
But the FBI did nothing wrong in lying to the FISA court to get permission to spy on a US Citizen and Presidential Candidate on behalf of his political rival.