v2.71 revision(20190821):
1.fix download image at last partition bug up
2.optimize the progress of downloading
v2.72 revision(20200113):
1.fix erase flash is timeout on nor flash up
v2.73 revision(20200520):
1.support with exporting com log
v2.74 revision(20200723):
1.take small slice to erase nor flash
v2.75 revision(20200915):
1.fix virtual list grid msg collision
v2.76 revision(20200925):
1.complete to download new idblock
v2.78 revision(20201102):
1.support to create download list from parameter
v2.79 revision(20201111):
1.support new loader format
v2.8 revision(20210104):
1.fix chunk size beyond 4g in sparse download
v2.81 revision(20210128)
1.support to list storage and switch storage
