Jiayu S3 Advance - Dont enter download mode

Hi everyone,

I try to install new ROM throw SPTool and cannot enter Download Mode. I went through multiple tutorials and nothing worked. I cannot do through recovery because it a great update from Android 4.4 to 5.1.
How can i enter download mode? Is there any button combination to enter? I dont want to enter recovery, I want DOWNLOAD.

Too much thanks

Galaxy S Advance

Hello friends

I have a problem I dropped my phone baseband version for XXXX will be displayed and the SIM card does not detect my phone model Galaxy S Advance were to meet Mskal please do help me , thank you friends