Even with the best versions, errors can occur. Here is how to fix them.
The for BlackBerry 9800 is usually the most stable and feature-complete. The last widely used versions were: blackberry 9800 flash file top
If your phone is stuck in a boot loop, it usually means the SFI file is corrupted. To fix it, you need the official OS installed on your PC and a specialized tool to "force" the flash. Even with the best versions, errors can occur