Looks like the NEX4100 update is currently unavailable (clicking the link does nothing).  It is now referencing 1.053 vs the 1.05 that's available for all other models.

I imagine that customers started updating the firmware and Pioneer discovered a problem and have yanked the FW.

Just letting anyone know who has the new FW but has not yet updated it.

Just tried downloading. Working now for 1.053. I'm sure they labeled it a different version as 4100 doesn't have AVICSYNC which is the big 1.05 update for the other units.

Okay, my "bad".  The file was able to be downloaded, a security setting in both of my browsers was refusing to download it even though I download tons of files regularly on this machine.

I couldn't get it to download either.  Now that it does it, and I unpack the zip folder it shows a 5100NEX folder.  Not sure if I should flash the firmware or not since it doesn't look like it is for the right head unit. 

I couldn't get it to download either.  Now that it does it, and I unpack the zip folder it shows a 5100NEX folder.  Not sure if I should flash the firmware or not since it doesn't look like it is for the right head unit. 

Read the update instructions and it will all be cleared up.

Do everyone's settings still show version 1.05 instead of 1.053, even though they used the firmware for 1.053?