Well I don't know if it's any help...
but on my 1070 I went from a september 05 firmware...to a may 06 firmware without doing any other in between (2 or 3 other I think)
and so far so good...
maybe someone else can confirm for you...
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Outlaw 1070-Mirage M-290(main)+MCC(center)+Omnisat Micro(sides) nanosat(back)+ +PS12-90(sub)-Technics SL-5 turtable+Cambridge Audio 540P-HTPC - SamsungDTB-H260F HDTV tuner - Optoma HD 20 +100' Draper screen -lots of spaghetti and toys