zx908

I think you're confusing GPS fix time and device time. Those are store separately and mean different things. Message type 1a doesn't have any GPS data, so Traccar will use the last known GPS fix.

zx908 is working now!

as carlos said timezone must be set correctly

timezone,0
was the solution

i have both zx-905 and zx-908 working all at 5199 topin

If someone want to write your own firmware for ZX908 (Or another EC800N-based device) - You can use QuecPython project.
I grab some info in one place: https://github.com/FoxExe/ZX908/

Mine worked for about 5 mins before giving up on receiving texts.
I am just getting "SM delivery failure" on the backend dashboard.

I was able to set the server and get the device ID but after a few more commands, it just stopped dead.
Connected it via USB and can use AT commands to talk to the modem but the actual device does not look to be working very well, if at all.

Queries I have found so far https://cryptpad.fr/sheet/#/2/sheet/view/CyOVe8MoHQMKdd74XtoAA5apbGV06WD5fBAsOaIQLTU/

Looks like there is an updated board. Mine has more GPIO ports on the side and uses the EC800M-CN vs the EC800N-CN.
The EC800M-CN is a CAT4 modem and does consume more power.

Anyone have any ideas on what to do with it no responding to SMS anymore?

Ah, cleared the stored text with the AT command and it is now receiving texts again.
But it does not respond to any of the device info or IMEI requests.

How do I flash that firmware Fox?