破了產可再買居屋嗎？

As I know applying 居屋 is not an issue. The major problem is whether he can still apply for home loan/mortgage from others. Because your friends 破產 before, Bank will have record on this. Usually the big bank will reject the application. Smaller bank may consider it with higher interest rate. You can ask your friend to check with the bank first.

理論上可以買居屋

但實際上
因為沒有金融機構願意為其做按揭
倘有有這麼多的資產能一次過支付樓價及律師費用，則會明顯地超出資產上限

我估唔可以...
建議上申請居屋網頁睇下...
香港房屋委員會網頁：
http://www.housingauthority.gov.hk/b5/residential/shos/hos/