Visa for adult dependent brother

[David26]

Hi everyone,
I am a british citizen. I have a dependent brother who when arrived in uk was under 18 and got the 5 years residence visa. Now i need to apply for his permanent residence but he is over 21 years old and working a really good job earning more than 25k per year. What are the chances of getting his application approved and getting the visa?

[secret.simon]

What visa did your brother arrive on? What is the UK immigration status of the parents? What nationalities does he and you hold?

[David26]

He is indian national and arrived in the uk as my Dependent when he was 16. I am his only relative and guardian. I am British national and he is indian national.

[vinny]

Didn’t they grant him an Entry clearance endorsed with an ILE observation?

Is he leading an independent life?