Raspberry Pi Holdings PLC (LSE:RPI), the maker of low-cost computing boards, has upgraded its full-year profit outlook after a stronger-than-expected first half, with adjusted EBITDA for the period now expected to reach at least $38 million. The company said profitability in the six months to 30 June was materially ahead of the same period last year, with unit shipments expected to exceed 4 million for the half.