hi all.  new install of AVH-4100NEX here.  firmware was upgraded to 1.05.  when i attempt to watch video from SD card i cannot get past the warning screen which asks me to engage-release-engage the parking brake.  (see image.)  i have the microbypass circuit installed so --i assume-- it is unable recognize that ive engaged the brake and thus the ÓK remains greyed out.

1. does anyone running old firmware (such as 1.03) encounter this problem?

2. might anyone have an old copy of the 1.03 firmware that they could link to?

2a.  is it even possible to back rev the firmware on this unit?

many thanks,
mike

microbypass circuit

http://www.amazon.com/MicroBypass-Parking-Automatic-Interface-AVH-4100NEX/dp/B00VKQ6ECQ

My guess is that it's not hooked up correctly... double check the install...

How did u put the videos on the SD card

Same exact problem as OP.  'OK' button is grayed out on the 'CAUTION' screen.  Microbypass is installed and worked prior to upgrading firmware.  Any suggestions?   

Ran into this same issue after upgrading to 1.053.

No fix other than rolling back to the previous firmware.

I believe this is it.

http://drivers.softpedia.com/get/DVD-BluRay-Media-Players/Pioneer/Pioneer-AVH-4100NEX-A-V-Receiver-Firmware-103.shtml