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i want to start working on bmws what are the softwares available that i can use to start ?
There isn't a specif software that you can use to tune BMW's.
You will need a tool to read/write the ROM file. Like CMD Flash, Kess V2, Ktag etc.This tools have their own software to read/write.
Then you will need a software like ECM-Titanium which is provided by Alientech correct me if am wrong. Or you can use winOLS which is way more complex and needs more experience.
Also from 2008 and onwards bmw ecu's are locked which means that you will most of the time need to bench flash them.
Keep in mind Stock Ecu reflashing is way complex than doing standalones, you are dealing with hundreds of maps.