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Most Firmware updates are usually set-up to include all prior changes that were added in older FW. The exception would be when a change introduced a bug in which case the new firmware would contain the modified version of an update to neutralize the problem or it's omission altogether. When they list what update the new firmware is for they usually only indicate the new functions and bug fixes.
If you are required to be at a certain level of firmware before you can advance to the next level, this should be part of the notification. In these cases you should be given access to any required older FW's.
So really any firmware beyond 17d should include active TOC within ePubs as well as "Content search" in ePub and PDF. Each new firmware is a copy of the older FW plus the new additions.
I didn't see FW 18d when it was realeased. I wonder if it was released to fix a problem with 17d. I have been on the look out but for some reason I don't get auto notified.
I just tried to access Aluratek.com and was given a "Band-width exceeded" error for the site. I'll try again later as instructed.
When I first bought my ALP it was at FW level 17 (no letter following the 17). It did not support TOC for ePub. Only PDF had TOC support but PDF did not have "Content Search".
PDF at that time did have "Text Flow" support which the JB did not have until FW 35a.
I hope I was clear in explaining how firmwares work (in most cases). Again this all depends on the manufacturer and how savy they are w/re to customer support.
John
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