The R7 "E" release had problems I believe related to losing programming. There had been so many bugs and fixes that created new bugs that it's hard to keep track. Apparently you may have uncovered another problem but that's really a moot point. Bottom line is that any pre "K" release should be replaced or upgraded to at least an R7 "K" to assure reliable operation. The "O" was only available on factory units. Of course the R8 is the current release.

-Hal

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