If you have a Sony Ericsson Xperia X1, X10, or any phone with CID49, CID51, CID52 (e.g., W995, C905, W705), Aerix v099 will NOT work. Using it on these models will result in a hard brick (dead boot). For those phones, you need SETool2 or paid unlocking boxes.
First, let’s demystify the keyword breakdown: