There are three parts. The first step is to use flux to output the image in 8 steps. The second step is to use 2x magnification + block magnification and flux block repair. The third step is to add the icing on the cake and add details in latent. I found that traditional flux magnification does not really increase the pixels and is very stuck. According to my research, block magnification is the best way to bring out the power of flux, so I made this workflow.