Can you scan across a copy of the refusal letter?
Both images appear to be of the same page.
Did your friend not submit his bank statements as part of the supporting evidence?
He should have submitted both payslips and bank statements.
Unfortunately, there is no right to appeal and the only thing he can do is submit a fresh application.
I would suggest he employ a solicitor or immigration advisor to file the application for him.
I hope this answers your questions. If so, kindly rate the answer and provide feedback.
If you have any further questions, please do not hesitate to ask.