take a look at this and the wiki… it has been a while what is the production date of your device? it has been a while since i did this but you have to update the bootloader so you can flash a new firmware to it
it also may be that the gps just doesnt work on that device… now that i think about it… yeah… i think the problem is that the gps was some idea whereby to lower the power consumption it would offload the computation power to the cloud for post processing and that cloud server died and the gps would not work anymore… also it tried to use wifi and bluetooth sniffing to locate without gps… it was a failure… but all you have to do is get another gps and conect it to the uart… atleast … i am using my on meshtastic right now and i know it works with an external gps… but i cant sware it works on sensecap…
anyway keep asking questions here and i will try to help!