: If you are looking for a "paper" to fix a specific mechanical or software fault, you are likely looking for a TSB . For example, SI B65 08 14 is a common bulletin for F25 head unit software issues. 3. I-Level (Integration Level) Explained
While a software update won’t turn your 28i into a 35i, BMW frequently refuels the engine control unit (DME) with better timing curves, knock detection, and fuel trims. bmw f25 software update
Depending on your F25’s age (2011–2017), a full software update covers: : If you are looking for a "paper"