Websites claiming to offer a "highly compressed" Blur ISO for PPSSPP are frequently hosting or renamed files of other games. Since an official PSP port never existed, these downloads are not genuine.
If you own the game on a service like Steam, you can stream it to your phone using Steam Link or GeForce Now . To help you find a game that actually works on your phone: download blur game file for ppsspp android highly compressed
There is no official game for the emulator. The original 2010 racing game was released only for PlayStation 3 Websites claiming to offer a "highly compressed" Blur