Isaac Marino Bavaresco wrote: > I use word-writes to register in an array of words what blocks were > already received. Huh? > The blocks may be received in any order and there > is a mechanism to tell the server what blocks are still needed. But that only applies to the order the blocks are temporarily saved in your buffer space. The bootloader doesn't run until all the blocks are buffered= , so it can write the app image in sequential order. None of this explains why word write are necessary, as apposed to page writes. ******************************************************************** Embed Inc, Littleton Massachusetts, http://www.embedinc.com/products (978) 742-9014. Gold level PIC consultants since 2000. --=20 http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .