TOSHIBA COMBO 20 HLV15, DVD player dezoning

Does anyone know what I should do to turn ONE TOSHIBA COMBO 20 HLV15 into a multizone one or to make it able to read DVDs from zone 1 as well as zone 2 ? Thanks in advance for your help
i live in france and i bouth thison ebay for my camping car and it doesn’t work !