Smurf786 Posted January 6, 2014 Report Share Posted January 6, 2014 Hi everyone, I have a F940BT that i tried to update to 5.100 from 4.00. I followed the guide and instructions to the book. Even followed a video from pioneer in australia. I did the 1. program ucom write and it ran the update twice before coming up with cs err. I wasn't able to exit out of the update console. In the end i managed to get the head unit to turn off but now it will not boot up at all. No boot logo just a blank/black screen. Does anyone know what i can do to revive the unit back up please? Many Thanks Smurf Quote Link to post Share on other sites
dr0op Posted January 10, 2014 Report Share Posted January 10, 2014 I'm 99% sure ur unit got bricked. It's a software failure u got on your hands now so u got to get it fixed @ pioneer, or go back to where u bought it from and they will send it into pioneer for repairs. Quote Link to post Share on other sites
kraftyskillz Posted January 24, 2014 Report Share Posted January 24, 2014 sounds like exactly the same problem i just had. The unit is stick on Program Forced Write. Followed the steps exactly so why will it brick. My screen is currently still on and seems i need to pull my battery to switch it off. Only reason i updated was to get the appradio working, now this..... Update Upon returning to my car, the screen was off and the system seems to be fine now. Did give me a lil bit of a scare. Don't even care if the firmware update completed, just glad to have it back. Quote Link to post Share on other sites
taberg Posted February 12, 2014 Report Share Posted February 12, 2014 Hi everyone, I have a F940BT that i tried to update to 5.100 from 4.00. I followed the guide and instructions to the book. Even followed a video from pioneer in australia. I did the 1. program ucom write and it ran the update twice before coming up with cs err. I wasn't able to exit out of the update console. In the end i managed to get the head unit to turn off but now it will not boot up at all. No boot logo just a blank/black screen. Does anyone know what i can do to revive the unit back up please? Many Thanks Smurf Hi all, I've got the same problem as you... Bought a 2nd hand avic f940bt. Installed the 2013 maps (worked perfect after that) Bought and installed the ui202navi for iphone 5 connectivity Read that I had to update firmware to 5.1. Put the firmwared on formatted sd-card Here I used write all ucom data, instead of write ucom data. So i saw two rows updating. and it was successful. Then I waited, and waited... nothing happened... so I thought. ok lets try the "write ucom data". It started writing again, but repeated it several times with a CS error. Then the unit would not shut off. at all, not even when I removed the key. Then I tried to navigate, and when i doubletapped the screen, the unit shut off. And not it has been staying off since... no life at all. I tried disconnecting the battery, and checking the fuses... no reaction. what to do? any suggestions? Cheers! Quote Link to post Share on other sites
Karlos76 Posted February 16, 2014 Report Share Posted February 16, 2014 Same thing happened to me - left car off for 5 hours, came back to it and no lights on unit Quote Link to post Share on other sites
kraftyskillz Posted February 24, 2014 Report Share Posted February 24, 2014 Would be interested to know if you were able to get it working? Also, anyone had any issues with the videos not working after upgrading to ios 7.0.4? Also having problems with the apps running. Just get a blank screen Quote Link to post Share on other sites
Chirpy Posted May 26, 2014 Report Share Posted May 26, 2014 Hi I also have a F940BT which ws installed 5 days ago. I tried to update to 8.05 from 8.02. I did the same as Smurf786 - I followed the instructions and followed a video from Pioneer Australia - Published on Oct 20, 2013. I ran the first ucom and it completed then it ran again and read "erasing" and the it read "cs err". The screen stayed on for about 1 hour (I could not turn it off) and then turned off by itself. I now have a black screen. Does anyone have any updates? Quote Link to post Share on other sites
jgcir1 Posted September 10, 2014 Report Share Posted September 10, 2014 Assuming I'm screwed, but any of you guys have updates on this? Quote Link to post Share on other sites
nc35 Posted September 13, 2014 Report Share Posted September 13, 2014 Possibly a dumb question But have you tried the super testmode or the hack to boot to wince? Can you not just force reinstall the software from these options? Quote Link to post Share on other sites
dcerebel Posted August 13, 2021 Report Share Posted August 13, 2021 the same problem like my avic f940bt, I ran the first ucom and it completed then it ran again and read "erasing" and the it read "cs err". The screen stayed on for about 1 hour (I could not turn it off) and then turned off by itself. I now have a black screen no light. please help Quote Link to post Share on other sites
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