I ftp the image to the HD on the box and then open install manager from the BluePanel .
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Select sdb2 as the destination and your ftped image as the source ...
When you re-boot after the install select USH1 from multi-boot . must be set to b4t not freebox etc ..
BTW the image I'm using was downloaded from the PKTeam website where there is one for NAND and one for USB .I'm using the USB one . Didn't want to write the NAND one just in case but works great from 4Gb microSD card in an adaptor ....