hallo<br>i need to upgrade from 4.2 to 6.x , is it easy to done or we have to upgarde to 5.x first , what about the hardware , does the sever need to be replaced with another one or it can be done on the MCS series server ? , what about the linux operating ? which is suitable version ( suse , redhat , debian .....) for this upgarde <br><br>thanks you all & keep up the good work guys .<br><p> 
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