Inspiron 15 7000 Series 7548 - GPU problems

My laptop wont change from CPU to GPU. 

Any suggestions on a fix would be great, tried many theories that have worked for others.

I believe my laptop is supposed to have Radeon M270, however AMD automatically find your software downloads the M265. I've tried to make this work but I've ran out of options. 

• I've gone to Device manager, disabled the gpu, and updated so it updates to M270, however then when I right click to view the AMD settings I get an error that my software is not supported?
• (When on M265) I've got my global application settings on maximize performance.
• Steam is also on high performance
• I've messed about with all the settings within the AMD radeon settings, trying to find optimal performance however I still find games are running on fps 4, even when the game settings are all on very low. 
• I've also used the command Prompt (Admin) fix that has been mentioned on various forums.

My PC:

• (GPU-Z info)
• AMD Radeon R7 M265 Series currently downloaded
• Intel(R) HD Graphics 5500
• GPU Mars?
• Memory type DDR3 (Hynix)
• Driver Version: 22.19.162.4 (Crimson 17.4.4) WHQL / Windows 8.1 64bt
• Computing: OpenCL and Direct compute 5.0