Hello to All,
I am having the similar or the same problem that Jalvini had with the AVIC-Z140-BH that was installed in 2012 by a Pioneer authorized dealer, which is " Program Start Up Error" with the number 6 in the bottom right hand corner. This unit has never gone through any SW/FW update.
I have tried hard reset 3 ~ 4 times (pulled battery off, waited for 5 minutes and re-started).
Thanks to the detail instructions in this tread, I created the PRG.FLG, an empty file, on my PC, copied it to the SD that has Testmode.key in root. Rebooted the AVIC into TestMode, then selected PRG.FLG on