Kyzuuh Posted July 29, 2017 Report Share Posted July 29, 2017 Hey guys, first post here. I haven't been able to find anything on password recovery for the 4200NEX. What files do I need to put this headunit into test mode? Also, the SD card slot is behind the screen and requires a password to access so I only have the rear usb port. Is there a way to get into test mode from that port? Thanks for any help ahead of time, I just bought this car and the previous owner is unresponsive. Quote Link to post Share on other sites
bonee Posted July 29, 2017 Report Share Posted July 29, 2017 Put Testkey_A into USB Quote Link to post Share on other sites
Kyzuuh Posted July 29, 2017 Author Report Share Posted July 29, 2017 Put Testkey_A into USB Where can I retrieve that one from? And also, is it the same testmode.key for all the pioneer headunits out of curiosity? Quote Link to post Share on other sites
bonee Posted July 29, 2017 Report Share Posted July 29, 2017 join the chatroom. https://avicsignup.herokuapp.com/ And i'll help you out Quote Link to post Share on other sites
Kyzuuh Posted July 30, 2017 Author Report Share Posted July 30, 2017 join the chatroom. https://avicsignup.herokuapp.com/ And i'll help you out Could you just PM me here, I'm not very familiar with slack Quote Link to post Share on other sites
Kim818 Posted October 22, 2017 Report Share Posted October 22, 2017 I am having the same problem. Bought a car used from owner that came with this stereo. Started having car trouble wouldn’t start up dead battery. Replaced battery AAA now stereo asking for password. Can’t locate last owner I bought car from. Need help unlocking stereo please . Where Can I get the test key a for the Pioneer AVH 4200 nex stereo? Would appreciate the help greatly ! Quote Link to post Share on other sites
Audi4 Posted October 1, 2018 Report Share Posted October 1, 2018 I downloaded the .rar file, decompressed it and copied the files to a 8 GB USB stick. I had previously wiped the stick and reformatted it. I'm using a Mac. I formatted the USB stick first time as MS-DOS, tried it, nada. Went back and reformatted the stick as ex-FAT, put the files back on it, checked to make sure they copied over. Deck still did not recognize the stick. Now in my case, the deck (NEX 4201) was installed with a USB dongle out to the glove box from port 1. I have used this connection before to update firmware, and it works fine. However, in this case, the deck did not see the USB stick, or to be precise, the deck did not go into 'factory service mode.' I've rooted other Android devices so the process is not completely foreign to me. Any suggestions? Quote Link to post Share on other sites
Audi4 Posted October 1, 2018 Report Share Posted October 1, 2018 Tried to hit that thread on Slack. No luck. Really like the video! Shows it can be done. I think my USB stick is good. Maybe something wrong with my dongle. Ugh. Quote Link to post Share on other sites
Fawn Posted June 27, 2022 Report Share Posted June 27, 2022 On 7/29/2017 at 7:53 PM, bonee said: join the chatroom. https://avicsignup.herokuapp.com/ And i'll help you out Hi bonee, could you help me recover my password on my pioneer mixtrax avh-4200nex My alternator had to be changed, now radio locked asking for password and we can not remember it. Thank you Fawn Quote Link to post Share on other sites
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