the end of CJ730gsm gps trackers?
GPS week rollover. It's affecting some devices. https://en.wikipedia.org/wiki/GPS_week_number_rollover
The fix:
Traccar 6.9 August 19, 2025
List of main changes in this release:
Fix for the GPS week rollover. Many devices were recently affected by the rollover issue, which should now be resolved. No configuration is required.
@TheSouthCamera correct many CJ730 having problems after gps week rollover
@gustavofarias & @richard Thank you for your suggestion. But as I feared the problem lies within the device. I used a clean install of Traccar 6.9, and the same results. Though in the logs I do see the modified dates.
The problem lies in the device. Somehow it gets a date internally, when it resets its date to 2006 it keeps track of the newest position. Unfortunately, this means when it transmits its current position it will forever keep transmitting the position with the newest date.
In short, the quickest way to fix this is replacing the device seeing that the 4g CJ730Plus is still working I will probably go for that. Probably in time someone who’s far more skilled at firmware dumping may be able to rewrite the code to transmit the received valid gps data and ignore the compare date line.
Bump!
Looking for a fix, any help is appricieted...
I fixed my CJ730 Plus by flashing the gps firmware from MiCODUS:
https://www.micodus.com/news/file
https://www.youtube.com/watch?v=LvQqdkKDJJg
Be very careful to use only GPS as shown in the video/pdf manual
I made my own cable and you need a usb to ttl adapter. Connect only GND, tx,rx pins. You need to be handy with electronics for the cable. I was lucky to find a suitable connector and cable on my electronic box because the pins are really tiny. With a multimeter I found the GND pin and tx/rx pins are the middle 2 pins.
@Redis Good call. I can confirm following the instructions I have tried one of my 730s and it appears to be working.
There are contact points on the board that can be used, but i used a webcam plug from an old laptop and that fitted the port on the side of the device. I used the ESP D1 Mini bord held in reset to act as the connection to USB. you can test the connection (Send and Receive) with the Arduino serial monitor or any ttl software. make sure its the one outputting the bootup not the gps output.
start the software and follow the PDF or video. make sure the GPS is turned off and only turn on after you press start on the software.
Thank you for sharing this information. Has someone an idea what's the name of the cable connector on CJ730? A already have an TTL Adapter but i need to find a suitable connector to the CJ730
Micodus sells a cable on AliExpress but they don't deliver to my country.
the name connector is
JST 0.8mm Pitch Spacing 4 Pin Micro Connector
Hello.
I have noticed a problem with CJ730 GSM (I have 6 of these) this seems to have started about 18/08/2025. the trackers are communicating to the traccar service, but the GPS location never updates. (unless rebooted then the tracker will send 1 correct location and then repeats the same coordinates)
Been looking at the data from the 19th. coming into the device and it is receiving the GPS correctly but whatever its little microcontroller is doing after I don’t know. it’s going a bit beyond me.
I was able to watch it boot up via TTL and see it load up my ID and domain, but it doesn’t let me do much other than some stripped AT commands.
Looking back at the traccar logs, the trackers are losing the date and its resetting back to 2006.
My guess it’s the microcontrollers have some kind of flaw in the firmware. The ttl boot loader had a date of 2006 so I guess the software inside was never meant to last this long. not sure what
thought I should say something just in case, and maybe someone has an answer to maybe flash them with an updated firmware?
oddly but I have not checked ttl, I have a 4g CJ730Plus and that is the only one (so far) that is working.