Well the upgraded version of redmi 1s was the redmi 2 with the price tag of 7000 rs. This phone is similar to the redmi 1s as it have same 8 mega pixels back canera but front camera just improved a little bit as it has 2 mega pixels front facing camera.
The phone does work very well sound quality is much better then redmi 1s. Overall it is a good budget smartphone with some good specks in two different varient one has 1gb ram, 8gb internal and second one has 2gbram and 8 gb storage.