On 6/7/2019 at 4:51 PM, romaine67 said:

I got it!  Thanks so much for posting this! I refuse to ship it back and pay $85.00

Can you explain the steps to me please 

3/15/2022

Placing Hackmode.Key & Testmode.Key allowed AVIC-X850BT to boot with File Maintenance Menu. Then using Volume up and down buttons on the radio face allowed navigation to NAND/System/Security menus, then reading out Security.Dat onto the screen revealed the password and reminder key.

Removing SD card boots radio which then was unlocked with the recorded password.

Worked as described above.

Pioneer wanted me to uninstaall radio, ship to them $18.00, the shop would unlock for a falt fee of $50, then free ship back to me.  I saved the $68.00 plus potential damages and other shipping cost.

Thanks to this site the radio is now operating as designed without lock.

WC Phillips

Dayton, Ohio