An unregistered firm faces three disabilities under Section 69 of the Partnership Act: (1) it cannot file a suit against third parties, (2) a partner cannot file a suit against the firm or other partners, and (3) it cannot claim a set-off exceeding Rs. 100. However, third parties CAN sue an unregistered firm - this is NOT a disability but a right of others. The firm remains vulnerable to lawsuits despite being unregistered.